Units 1-2月考复习之重点词汇变形分层必考100 题- 2026-2027 学年译林版八年级上册英语

答案解析 第一部分：基础识记层级 1. 答案：believe（相信）。解析：believe 意为“相信”，can hardly believe one's ears 是固定表达，意为“几乎不敢相信自己的耳朵”，when 引导时间状语从句。 2. 答案：face（面对）。解析：face 作动词意为“面临、面对”，we face difficulties 作从句谓语；face 此处为及物动词，后直接跟宾语 difficulties。 3. 答案：cookies（饼干）。解析：cookie 意为“饼干”，a box of 后接可数名词复数，故用 cookies；与 a bottle of milk 并列作 buy 的宾语。 4. 答案：bit（少量）。解析：bit 意为“少量”，a little bit of salt 表示“一点儿盐”；a bit of 后接不可数名词，此处指盐，故填 bit。 5. 答案：balloons（气球）。解析：balloon 意为“气球”，主语 These 为复数，故用 balloons；flying high 作后置定语与其呼应。 6. 答案：cheap（便宜的）。解析：cheap 意为“便宜的”，作定语修饰 skirt；与 was only thirty yuan 相呼应，说明价格低。 7. 答案：boring（没趣的、令人厌倦的）。解析：boring 意为“令人厌倦的”，修饰物 film，说明电影本身令人乏味；so...that... 结构表结果。 8. 答案：foreign（外国的）。解析：foreign 意为“外国的”，作定语修饰 students；come from different countries 进一步印证“外国的”。 9. 答案：textbook（课本、教材）。解析：textbook 意为“课本”，This English textbook 指“这本英语课本”，作句子主语。 10. 答案：forward（向前）。解析：forward 意为“向前”，look forward to 是固定短语，意为“期待”，to 为介词后接动名词 seeing。 11. 答案：encourage（鼓励）。解析：encourage 意为“鼓励”，encourage sb. to do sth. 为固定搭配“鼓励某人做某事”；主语 parents 为复数，用动词原形。 12. 答案：cheerful（高兴的、快乐的）。解析：cheerful 意为“高兴的”，作系动词 was 的表语；与 got a new bike 的语境相呼应。 13. 答案：lie（撒谎）。解析：lie 意为“撒谎”，与前半句 tell the truth（说真话）构成反义对照；never 后接动词原形，情态动词 should 后用原形。 14. 答案：aware（意识到的）。解析：aware 意为“意识到的”，be aware of 为固定搭配，意为“意识到”；此处 of 后接名词 the danger。 15. 答案：seat（座位）。解析：seat 意为“座位”，take one's seat 是固定搭配，意为“就座、坐下”；your 后接名词 seat。 16. 答案：nod（点头）。解析：nod 意为“点头”，作谓语；情态动词 could 后接动词原形，nod 在此表示动作。 17. 答案：thought / idea（想法、主意）。解析：thought 意为“想法、主意”，It is a nice thought to do sth. 中 it 为形式主语，to do 为真正主语；此处 idea 亦可，两者皆表“想法”。 18. 答案：test（测验、考查）。解析：test 意为“测验”，have an English test 意为“进行一次英语测验”，作 have 的宾语。 19. 答案：movies（电影）。解析：movie 意为“电影”，与 cartoons 并列作 watching 的宾语；表示看电影用复数 movies。 20. 答案：plastic（塑料的）。解析：plastic 意为“塑料的”，作定语修饰 bags；fewer plastic bags 与 protect the environment（保护环境）的语境相符。 21. 答案：earthquake（地震）。解析：earthquake 意为“地震”，the great Tangshan earthquake 指“唐山大地震”，happened in 1976 为其后置定语。 22. 答案：suggested（建议）。解析：suggest 意为“建议”，suggest that + 从句（从句谓语用 should do，should 可省略）；主句为过去语境，故用过去式 suggested。 23. 答案：fight（打斗）。解析：fight 意为“打斗”，have a fight with sb. 是固定搭配，意为“与某人打架”；a 后接单数名词 fight。 24. 答案：international（国际的）。解析：international 意为“国际的”，作定语修饰 sporting event，意为“国际体育赛事”。 25. 答案：drama（戏剧）。解析：drama 意为“戏剧”，the history of Chinese drama 意为“中国戏剧的历史”；作 of 的宾语。 26. 答案：humour（幽默）。解析：humour 意为“幽默”（英式拼写，美式为 humor），作主语；his humour always makes us laugh 与其呼应。 27. 答案：vacation（假期）。解析：vacation 意为“假期”，summer vacation 是固定搭配，意为“暑假”；〈美〉度假用 vacation。 28. 答案：ourselves（我们自己）。解析：ourselves 意为“我们自己”，by ourselves 是固定搭配，意为“我们独自、靠自己”；与 such a short time 形成语境。 29. 答案：finished（完成）。解析：finish 意为“完成”，此处叙述过去发生的事，故用过去式 finished；finish 后接动名词或名词作宾语。 30. 答案：understand（理解）。解析：understand 意为“理解”，情态动词 can 后接动词原形；understand him well 意为“很好地理解他”。 31. 答案：attacked（攻击）。解析：attack 意为“攻击”，叙述过去事件，用过去式 attacked；attack 后直接跟宾语 the mouse。 32. 答案：listeners（听众）。解析：listener 意为“听众”，the 后接可数名词复数指“听众们”，故用 listeners；谓语 asked...to do 与其搭配。 33. 答案：uniform（校服）。解析：uniform 意为“校服”，the school uniform 是固定搭配，意为“校服”；wear the school uniform 意为“穿校服”。 34. 答案：programme（节目）。解析：programme 意为“节目”（英式拼写，美式为 program），TV programme 意为“电视节目”；作句子主语。 35. 答案：dead（死的）。解析：dead 意为“死的”，作系动词 was 的表语，表示“已经死了”的状态；was already dead 意为“已经死了”。 第二部分：能力提升层级 1. 答案：energetic（adj. 精力充沛的）。解析：energy 为名词“精力”，be 后作表语需用形容词 energetic“精力充沛的”；be full of 后须接名词，故本句用 be energetic。 2. 答案：personal（adj. 个人的、私人的）。解析：person 为名词“人”，修饰名词 questions 需用形容词 personal“私人的”；personal questions 意为“私人问题”。 3. 答案：carefully（adv. 仔细地）。解析：careful 为形容词“仔细的”，修饰动词 read 需用副词 carefully“仔细地”。 4. 答案：unhappy（adj. 不快乐的）。解析：happy 为形容词“开心的”，felt 后作表语；此处“丢了玩具”语境消极，故用其反义词 unhappy“不快乐的”。 5. 答案：active（adj. 积极的、活跃的）。解析：act 为动词“行动”，修饰名词 boy 需用形容词 active“活跃的”；与 seldom takes part in 形成语境对照。 6. 答案：French（n. 法语）。解析：France 为国名“法国”，speak 后接语言，故用 French“法语”；speak English and French 意为“说英语和法语”。 7. 答案：dangerous（adj. 危险的）。解析：danger 为名词“危险”，It is + adj. + to do 结构中需用形容词 dangerous“危险的”。 8. 答案：humorous（adj. 幽默的）。解析：humour 为名词“幽默”，修饰名词 man 需用形容词 humorous“幽默的”；与 makes us laugh 相呼应。 9. 答案：bravely（adv. 勇敢地）。解析：brave 为形容词“勇敢的”，修饰动词 walked 需用副词 bravely“勇敢地”。 10. 答案：listener（n. 听众）。解析：listen 为动词“听”，every 后接单数可数名词，故用名词 listener“听众”；every listener 意为“每位听众”。 11. 答案：scared（adj. 害怕的）。解析：scare 为动词“使害怕”，be scared of 是固定搭配，意为“害怕”；作表语用形容词 scared。 12. 答案：bored（adj. 感到厌烦的）。解析：bore 为动词“使厌烦”，feel bored with 是固定搭配，意为“对……感到厌倦”；作表语用形容词 bored。 13. 答案：secretly（adv. 秘密地）。解析：secret 为形容词“秘密的”，修饰动词 looked at 需用副词 secretly“秘密地”。 14. 答案：encouragement（n. 鼓励）。解析：encourage 为动词“鼓励”，the teacher's 后需接名词，故用 encouragement“鼓励”。 15. 答案：foreigners（n. 外国人）。解析：foreign 为形容词“外国的”，介词 with 后需接名词，且表示“与……交朋友”用复数，故用 foreigners“外国人”。 16. 答案：fighter（n. 战士）。解析：fight 为动词“打斗”，work as a 后需接名词，故用 fighter“战士、斗士”。 17. 答案：feeling（n. 感觉、感情）。解析：feel 为动词“感觉”，your true 后需接名词，故用 feeling“感觉、感情”。 18. 答案：cheerful（adj. 快乐的、高兴的）。解析：cheer 为动词“欢呼”，were 后作表语需用形容词，故用 cheerful“快乐的、高兴的”；与 sang songs happily 相呼应。 19. 答案：honesty（n. 诚实）。解析：honest 为形容词“诚实的”，his 后需接名词，故用 honesty“诚实、正直”。 20. 答案：dead（adj. 死的）。解析：die 为动词“死亡”，had been 后作表语表状态，故用形容词 dead“死的”；had been dead for days 意为“已经死了好几天”。 21. 答案：height（n. 高度、身高）。解析：high 为形容词“高的”，my 后需接名词，故用 height“高度、身高”；turned out to be 1.65 metres 印证“身高”。 22. 答案：laughter（n. 笑声）。解析：laugh 为动词“笑”，The...of 结构作主语需用名词，故用 laughter“笑声”；laughter 为不可数名词。 23. 答案：misunderstand（v. 误解）。解析：understand 为动词“理解”，句中 friends 作主语需用动词，加前缀 mis- 表否定，故用 misunderstand“误解”。 24. 答案：belief（n. 信念、信仰）。解析：believe 为动词“相信”，his 后需接名词，故用 belief“信念、信仰”。 25. 答案：patience（n. 耐心）。解析：patient 为形容词“有耐心的”，show great 后需接名词，故用 patience“耐心”；showed great patience 意为“表现出极大的耐心”。 26. 答案：sensible（adj. 明智的）。解析：sense 为名词“感觉”，in a...way 中需用形容词修饰 way，故用 sensible“明智的、合理的”。 27. 答案：attentive（adj. 专注的）。解析：attention 为名词“注意”，were 后作表语需用形容词，故用 attentive“专注的、留意的”。 28. 答案：importance（n. 重要性）。解析：important 为形容词“重要的”，the...of 结构需用名词，故用 importance“重要性”。 29. 答案：truth（n. 真相）。解析：true 为形容词“真实的”，the whole 后需接名词，故用 truth“真相、事实”；tell the truth 意为“说出真相”。 30. 答案：awareness（n. 意识）。解析：aware 为形容词“意识到的”，our 后需接名词，故用 awareness“意识”；raise our awareness of 意为“提高我们对……的意识”。 31. 答案：Germany（n. 德国）。解析：German 为形容词/名词“德国的；德国人”，come from 后需接国家名，故用 Germany“德国”。 32. 答案：thought（n. 想法）。解析：think 为动词“思考”，his own 后需接名词，故用 thought“想法、思想”。 33. 答案：Japanese（n. 日语）。解析：Japan 为国名“日本”，speak 后接语言，故用 Japanese“日语”。 34. 答案：worse（adj./adv. 更差的）。解析：bad 为形容词“坏的”，even...than 表比较，需用比较级，故用 worse“更差的”。 35. 答案：development（n. 发展）。解析：develop 为动词“发展”，The...of 结构作主语需用名词，故用 development“发展”。 第三部分：综合拓展层级 1. 答案：joke（笑话）。解析：joke 意为“笑话”，tell a joke 是固定搭配“讲笑话”；if 从句提示“可能让人不开心”，故填 joke。 2. 答案：funny（好笑的）。解析：funny 意为“好笑的”，作定语修饰 boy；can always make everyone around him laugh aloud 提示“好笑”。 3. 答案：honest（诚实的）。解析：honest 意为“诚实的”，be honest 意为“诚实”；all of his classmates like to make friends with him 说明人品好。 4. 答案：danger（危险）。解析：danger 意为“危险”，There is a lot of danger 表示“有许多危险”；后句“随时可能倒塌”把“危险”做实。 5. 答案：truth（事实、真相）。解析：truth 意为“真相”，tell the truth 是固定搭配“说实话”；与 don't hide anything 形成对照。 6. 答案：brave（勇敢的）。解析：brave 意为“勇敢的”，be brave 意为“勇敢”；saved the drowning boy 体现“勇敢”。 7. 答案：unhappy（不开心的）。解析：unhappy 意为“不开心的”，作表语；misses her best friend very much 说明情绪消极，故用 un+happy。 8. 答案：active（积极的）。解析：active 意为“积极的”，be active in doing sth. 是固定搭配“积极参加”；与 keeping silent 反义对照。 9. 答案：laugh（笑）。解析：laugh 意为“笑”，make sb. laugh 是固定短语“使某人发笑”；funny dog 提示“好笑”。 10. 答案：friendship（友谊）。解析：friendship 意为“友谊”，a good friendship 作宾语从句主语；与 money 对比，强调友谊更重要。 11. 答案：bored（厌倦的）。解析：bored 意为“厌倦的”，be bored with 是固定搭配“对……厌倦”；与 long and boring movie 相呼应。 12. 答案：scared（害怕的）。解析：scared 意为“害怕的”，be scared of 是固定搭配“害怕”；sleeps with the light on 印证“怕黑”。 13. 答案：secret（秘密）。解析：secret 意为“秘密”，keep a secret 是固定搭配“保守秘密”；don't tell anyone else 形成对照。 14. 答案：energetic（精力充沛的）。解析：energetic 意为“精力充沛的”，feel energetic 意为“感觉精力充沛”；Doing sports 与“健康、有活力”呼应。 15. 答案：humorous（幽默的）。解析：humorous 意为“幽默的”，one of the most + 最高级 + 名词复数结构；his jokes always make us happy 提示“幽默”。 16. 答案：worst（最差的）。解析：worst 意为“最差的”，the...I have ever had 是最高级结构，故用 bad 的最高级 worst。 17. 答案：height（身高）。解析：height 意为“身高”，his 后接名词；has grown much taller 和 almost the same as mine 提示“身高”。 18. 答案：worse（更差的）。解析：worse 意为“更差的”，get worse 意为“变得更糟”；we all felt very worried 提示情况变差，用 bad 的比较级 worse。 19. 答案：thoughtful（体贴的）。解析：thoughtful 意为“体贴的”，the most + 形容词最高级；always notices small things and cares about others' feelings 提示“体贴”。 20. 答案：feelings（情感、感受）。解析：feeling 意为“情感、感受”，share one's deepest feelings with sb. 意为“与某人分享内心最深处的情感”；用复数 feelings。 21. 答案：attention（注意力）。解析：attention 意为“注意力”，pay attention to 是固定搭配“注意”；pay more attention to 意为“更加注意”。 22. 答案：suggestion（建议）。解析：suggestion 意为“建议”，a useful suggestion 意为“一条有用的建议”；give sb. a suggestion 为常用搭配。 23. 答案：offer（提供）。解析：offer 意为“提供”，offer sth. to sb. 是固定搭配“把某物提供给某人”；decide to do 后接动词原形 offer。 24. 答案：provides（提供）。解析：provide 意为“提供”，provide sb. with sth. 是固定搭配“向某人提供某物”；主语 library 为第三人称单数，用 provides。 25. 答案：improve（改进、提高）。解析：improve 意为“改进、提高”，improve one's English 意为“提高英语”；want to do 后接动词原形 improve。 26. 答案：develop（养成、形成）。解析：develop 意为“养成、形成”，develop good habits 是常用搭配“养成好习惯”；help sb. do sth. 后接动词原形。 27. 答案：differences（差异）。解析：difference 意为“差异”，many 后接可数名词复数，故用 differences；between...and... 为固定结构。 28. 答案：importance（重要性）。解析：importance 意为“重要性”，the importance of doing sth. 意为“……的重要性”；与 few people really do it 形成对照。 29. 答案：environment（环境）。解析：environment 意为“环境”，protect the environment 是固定搭配“保护环境”；keep it clean and beautiful 与之呼应。 30. 答案：searching（搜索、查找）。解析：search 意为“搜索、查找”，search for 意为“搜寻”；spend time doing sth. 结构，故用动名词 searching。 学科网（北京）股份有限公司 $ 译林版（新教材）八年级上册月考复习（Units 1-2） 重点词汇变形必考100题 学校：______________ 班级：______________ 姓名：______________ （考试时间：60分钟 满分：100分） 资料说明 整套词汇专项实行三阶递进训练，构建 “基础识记→词汇变形→语境解题” 学习链条，攻克拼写易错、词形失分、语境选词困难三大问题： 1. 基础识记（35分）：句意汉语提示写词。立足单元核心四会单词，依托短句巩固词义、规范拼写，夯实词汇基础。 2. 能力提升（35分）：词形转换专项。覆盖名词单复数、时态变化、词性转换、形副词转换等易错考点，融合词汇与语法，攻克变形失分难点。 3. 综合拓展（30分）：语境首字母填空。依托完整句子创设情境，考查词义辨析与固定搭配，训练结合上下文推理选词的解题能力。 第一部分：基础识记层级（35 分） 根据句意及汉语提示写出单词（共35小题，每小题1分） 1. I can hardly ________ (相信) my ears when I hear such good news from my best friend. 2. When we ________ (面对) difficulties in our studies, we should never give up easily. 3. In the school dining hall, I often buy a box of ________ (饼干) and a bottle of milk for breakfast. 4. Please pass me a little ________ (少量) of salt; the soup is not salty enough for me. 5. These colourful ________ (气球) are flying high in the blue sky and look really beautiful. 6. My sister bought a very ________ (便宜的) skirt in the shop, and it was only thirty yuan. 7. The film was so ________ (没趣的) that most of the students fell asleep in the cinema. 8. There are many ________ (外国的) students in our school, and they come from different countries. 9. This English ________ (课本) is very useful, and it helps me a lot with my study. 10. I am looking ________ (向前) to seeing you again at the beginning of the new term. 11. My parents often ________ (鼓励) me to do more exercise and keep healthy every day. 12. The little girl was very ________ (高兴的) when she got a new bike as a birthday gift. 13. A good friend should always tell the truth and never ________ (撒谎) to the people around him. 14. You must be ________ (意识到的) of the danger around you when you walk alone at night. 15. Please take your ________ (座位) before the film begins, or you will miss the best part. 16. When the teacher asked me a question, I could only ________ (点头) and say nothing. 17. I think it is a nice ________ (想法) to help the old people in our community on weekends. 18. The students are going to have an important English ________ (测验) next Monday morning. 19. My younger brother likes watching cartoons and ________ (电影) on TV every weekend. 20. We should use fewer ________ (塑料的) bags when we go shopping to protect the environment. 21. The Chinese people will never forget the great Tangshan ________ (地震) that happened in 1976. 22. My teacher ________ (建议) that we should read more English books to improve our reading. 23. The two boys had a ________ (打斗) with each other after school, but they are good friends now. 24. Many countries around the world take part in this important ________ (国际的) sporting event. 25. The history of Chinese ________ (戏剧) is very long, and many old people love watching it. 26. Tom is quite good at telling jokes, and his ________ (幽默) always makes us laugh a lot. 27. We will go to Hainan for our summer ________ (假期), and we will stay there for two weeks. 28. Our teacher told us that we could not finish the work by ________ (我们自己) in such a short time. 29. After three hours of hard work, we finally ________ (完成) all the homework our teacher had given us. 30. My best friend is an honest boy, and I can ________ (理解) him very well whenever he feels sad. 31. The cat ________ (攻击) the mouse quickly, but the little mouse still ran away in the end. 32. The speaker asked the ________ (听众) to keep quiet and listen carefully to his talk. 33. Everyone in our class must wear the school ________ (校服) on Monday mornings. 34. This interesting TV ________ (节目) is about how foreign students learn Chinese in a new country. 35. When the rescuers found the little bird by the road, it was already ________ (死的). 第二部分：能力提升层级（35 分） 用括号内所给单词的适当形式填空（共35小题，每小题1分） 1. My little brother is always __________ (energy), and he never feels tired after playing ball games. 2. It is not polite to ask a lady about her age or other __________ (person) questions. 3. You must read the exam questions __________ (careful) before you write down your answers. 4. The little girl felt very __________ (happy) because she lost her favourite toy on the way home. 5. James is not a very __________ (act) boy, for he seldom takes part in class activities. 6. Lily can speak both English and __________ (France), so she often helps the foreign visitors. 7. It is __________ (danger) for children to play near the busy road without their parents. 8. My father is a very __________ (humour) man, and he often makes us laugh with his funny words. 9. The little boy __________ (brave) walked onto the stage and gave his first speech. 10. In the school radio station, every __________ (listen) can call in and share their stories. 11. My little sister is __________ (scare) of the big dog, so she always hides behind me. 12. The boy felt very __________ (bore) with the long and boring speech and almost fell asleep. 13. She looked at the beautiful flowers __________ (secret), for she wanted to give her mother a surprise. 14. The teacher's __________ (encourage) made me feel much more confident about the coming exam. 15. My cousin likes to make friends with __________ (foreign) from different countries around the world. 16. His father works as a __________ (fight) in the army, and he is very proud of his father. 17. You should always share your true __________ (feel) with your parents when you are unhappy. 18. Although it was raining hard, the children were still __________ (cheer) and sang songs happily. 19. Everybody loves Jake because his __________ (honest) makes people trust him a lot. 20. The flowers in the garden had been __________ (die) for days because nobody watered them. 21. When the nurse measured me at the hospital, my __________ (high) turned out to be 1.65 metres. 22. The __________ (laugh) of the children filled the whole classroom after the funny story. 23. Sometimes friends __________ (understand) each other, so they should talk more to keep their friendship. 24. My uncle has never lost his __________ (believe) in the power of hard work and dreams. 25. The young doctor showed great __________ (patient) when answering the old people's questions. 26. My father always does things in a __________ (sense) way, so I often ask him for advice. 27. The students were very __________ (attention) in class and answered every question quickly. 28. We all know the __________ (important) of protecting the environment in our daily life. 29. In the end, the honest boy told his parents the whole __________ (true) about the broken window. 30. We should raise our __________ (aware) of protecting the environment and start from small things. 31. The new student comes from __________ (German), but he can speak Chinese very well. 32. Everyone has his own __________ (think) about this difficult problem, so we should respect each other. 33. My aunt has lived in Japan for ten years, so she can speak __________ (Japan) quite well. 34. Because of the heavy rain, the traffic was even __________ (bad) than we had expected. 35. The __________ (develop) of our city has been much faster than people expected. 第三部分：综合拓展层级（30 分） 根据句意及首字母提示补全单词（共30小题，每小题1分） 1. Don't tell a j________ to your classmates if it may make them unhappy or hurt their feelings. 2. My little brother is a very f________ boy, and he can always make everyone around him laugh aloud. 3. Tom is an h________ boy, so all of his classmates like to make friends with him. 4. There is a lot of d________ in that broken old building, so you should never go inside alone — it may fall down at any time. 5. Please tell me the t________ about what happened last night, and don't hide anything from me. 6. My grandfather was very b________ when he saved the drowning boy, though the water was cold and dangerous. 7. Lucy feels very u________ these days because she misses her best friend very much. 8. You should be more a________ in answering the teacher's questions instead of keeping silent all the time. 9. Jack's funny dog always makes us l________ a lot whenever we call its name. 10. Our English teacher often tells us that a good f________ is more important than money. 11. I feel so b________ with this long and boring movie that I really want to leave the cinema now. 12. My little sister is very s________ of the dark, so she always sleeps with the light on at night. 13. Please keep this s________ between you and me, and don't tell anyone else about it. 14. Doing sports every day can help you stay healthy and keep you feeling e________. 15. Michael is one of the most h________ students in our class, and his jokes always make us happy. 16. This is the w________ meal I have ever had, so I don't want to eat in this restaurant again. 17. My cousin has grown much taller this year, and his h________ is now almost the same as mine. 18. The doctor said that my grandfather's illness was getting w________, so we all felt very worried. 19. Of all the students in our class, Lily is the most t________ girl, because she always notices small things and cares about others' feelings first. 20. My best friend often shares her deepest f________ with me, so I know her very well. 21. You must pay more a________ to your lessons, or you will fall behind your classmates soon. 22. The teacher gave me a useful s________ about how to improve my spoken English. 23. The old man decided to o________ his seat to the woman with a baby in her arms. 24. This small library p________ us with many useful books and a quiet place to study. 25. If you want to i________ your English quickly, you should practice speaking it every day. 26. Reading a lot of books can help students d________ good reading habits step by step. 27. There are many d________ between Chinese and American eating habits, and we should respect them. 28. We all know the i________ of protecting the environment, but few people really do it in daily life. 29. It is very important for us to protect the e________ and keep it clean and beautiful. 30. The police spent two hours s________ for the lost little boy in the busy street. 学科网（北京）股份有限公司 $