11. The reason _____ I can’t come is that I have to prepare for the coming exam.

　　A. for

　　B. as

　　C. because

　　D. why

　　12. She studied hard at school when she was young; _____ contributes to her success in her career.

　　A. that

　　B. so that

　　C. so

　　D. which

　　13. Sound waves travel in the air in much the same way _____ water waves spread on the water.

　　A. as

　　B. that

　　C. where

　　D. in which

　　14. I’ve got a bottle of beer, but I haven’t got anything _____ I can open it with.

　　A. that

　　B. what

　　C. where

　　D. which

　　15. Writers can accurately describe objects ______ have never seen.

　　A. who

　　B. if they

　　C. they

　　D. that

　　16. It wasn’t such a good present _____ he had promised me.

　　A. that

　　B. as

　　C. which

　　D. what

　　17. Perhaps the day will come _____ people will be able to breathe clean air in cities.

　　A. when

　　B. while

　　C. as

　　D. since

　　18. To make up an objective test, the teacher writes a series of questions, _____ has only one correct answer.

　　A. each of which

　　B. some of which

　　C. which

　　D. what

　　19. A higher crime rate exists in cities _____ a large percentage of unemployment.

　　A. where have

　　B. that have

　　C. which they have

　　D. that having

　　20. Scientists call Newton’s idea _____ gravitation reaches throughout the universe the law of universal gravitation.

　　A. when

　　B. which

　　C. that

　　D. where

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