13. Many adults wish that they ____ harder at school, which is too late.

A. worked　　　 B. have worked　 　C. had worked　　 D. would have worked

12. –Tom is never late for work. Why is he absent today?-Something ___ to him.

　A. must happen　　　　 B. should have happened C. could have happened　 D. must have happened

11. Happy birthday, Alice! So you have ____ twenty-one already!

A. become　　　 B. turned　　　　 C. grown　　　　 D. passed

10. The shelves were lined with books which neither Hugo nor Sally would ever open, ___ read.

A. much more　 B. rather than　　 C. much less　　　 D. more than

9. The couple nearly is quarrelling all the time. I come to the point ___ I can’t stand.

A. which　　　 B. where　　　　 C. that　　　　　 D. what

8.It is reported that the United States uses ____ energy as the whole of Europe.

A. as twice　　 B. twice much　　 C. twice much as　　 D. twice as much

7. I will never know what was on his mind at the time, nor will ____.

A. anyone　　　 B. anyone else　　 C. no one　　　　　 D. no one else

6. ___ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.

A. To wait　　　 B. Have waited　 C. Having waited　　 D. To have waited

5. --_______?Why are there so many people ahead?---A car accident, I think.

A. What’s on　　 B. What’s up　　 C. What for　　　　 D. So what

4. I know you’ve placed great hope on me but I’m afraid I might ____.

A. let you down　 B. let you alone　 C. let you out　　　 D. let you up