内容正文:
1.__When__ the students heard the teacher's footsteps, they all stopped talking.
2.__While__ it was raining, the students were playing basketball.
3.You should turn on your computer __before__ you check your emails.
4.Please call me __as_soon_as__ you get there.
5.We haven't met each other __since__ he left Beijing last summer.
6.Please wash the dishes __after__ you finish eating, Lucy.
7.I won't go with you __until__ I finish my homework.
8.—Shall we go now?
—No, let's wait __until__ the rain stops.
9.Mr. Green changed his idea __after__ he thought it over and over again.
10.—Did you say anything to your parents __when__ they shouted at you?
—No, I was afraid to talk back. They looked really serious and scary.
阅读下面短文,在空白处填入一个适当的词,或填入括号中所给单词的正确形式。
Yuan Longping, a Chinese scientist, has saved people without any magic. His success on hybrid rice(杂交水稻) fed 1.__millions__(million) of people in hunger.
Yuan was born on September 7, 1930. 2.__After__ he graduated from Southwest Agricultural Institute(农业学院), he worked as a teacher at an agricultural school in Hunan.
About 50 years ago, some natural disasters(灾难) hit China. Yuan saw many people lose their lives 3.__because__ they were hungry every day. 4.__Since__ then, he has done research on how to grow good quality rice. In 1964, he 5.__found__(find) a natural hybrid rice plant by accident. It had great advantages over others. Yuan was so excited about 6.__what__ he discovered. He then decided to study this particular plant.
In 1973, he started to grow a type of hybrid rice. It produced 20% more rice each unit 7.__than__ common ones. The next year he had a great success. This progress made China the 8.__world's__(world) leader in rice production.
In China, most rice fields grow Yuan's hybrid rice. 9.__So__ he was called the “Father of Hybrid Rice”.
He died on May 22nd, 2021, 10.__but__ he still lives in our hearts forever.
学科网(北京)股份有限公司
$$