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连词专项练习 1. Save and protect natural resources, _ we’ll run out of them in the near future. A. and B. or C. but D. so 2. Scientists say we will have no water to drink _ we protect water resources. A. if B. when C. before D. unless 3. Fresh water is _ precious _ it is sometimes called liquid gold. A. such...that B. too...to C. as...as D. so...that 4. - _ did it take you to drive to the city center from the island? - One hour and a half. A. How far B. How long C. How many D. How soon 5. The apples here look good, _ they taste terrible. Let's look elsewhere before buying. A. but B. for C. or D. so 6. _ she was only twenty-two, she was already a highly successful businesswoman. A. Though B. Because C. Since D. If 7. Peter knew the solution to the maths problem, _ he was too shy to answer it. A. and B. or C. but D. so 8. –_ did the operations last? –For nearly eight hours. It was a great success. A. How often B. How long C. How soon D. How far 9. _ you know how harmful smoking is, you’d better get rid of it immediately. A. Unless B. Since C. Although D. Until 10. Mum, put on your glasses, _ you won’t see the notice clearly. A. then B. and C. but D. or 11. _ several accidents happened to some schools, all of the school’s outdoor activities have been stopped. A. Unless B. If C. When D. Since 12. Please practice playing the violin regularly, _ you will improve your skills. A. and B. or C. but D. so 13. - _ do you usually visit your grandparents? - We used to visit them once a month. But now we go to see them twice a month. A. How far B. How long C. How often D. How soon 14. Alice, _her friends, always takes a long walk after supper. A. both B.as well as C. but also D. and 15. I enjoy fresh air so I always sleep with the window open _it is really cold. A. unless B. when C. if D. since 16. -_ are you able to type the English words? -About forty to fifty words a minute. A. How often B. How fast C. How long D. How far 17. You will gain weight _ you reduce the amount you eat. A.