24. It suddenly ______ to me that this man might be a cheater.

A. happened　　 B. turned out 　 　　C. occurred 　　　　　 D. came about

23. He has made up his mind to devote his life _______ pollution _______ happily.

　 　　A. to prevent, to live　　　　　　　 B. to prevent, from living

　 　　C. to preventing, to live　　　　　　 D. to preventing, from living

22. With trees and grass ______ 35% of the area, our city has taken on a new look.

　 　　A. covering　　 B. covers　　 C. covered　　 D. has covered

21. How long do you think _________ the computer company launches a new model?

　 　　A. it will be before　 　　　　　B. will it be until　 　

C. will it be when　　 　　　　D. it will be that

20. Hospital staff burst into cheers after doctors completed a 20-hour operation to have one-year-old twins ______ at the head.

　 　　A. isolated　 　　B. separated 　　　C. divided　 　　D. removed

19. She stood up and walked to the teachers’ office, ____ what the head teacher would say to her.

A. to wonder　 　 B. wondering 　　　　 C. wondered　　　　　　 D. to be wondered

18. __________ to loud noises for a long time will have one’s hearing _________.

A. Exposed, harmed　 　　　　　B. Being exposed, harmed　

C. Exposing, being harmed　 　　　D. Expose, be harmed

17. I’m glad to introduce Mr. Smith to you, without ______ consideration our project would have ended in failure.

A. whom　　 　　 　　B. his　　　 　 　　C. whose　　　　　 　　 D. who

16. Mr. Li is such a considerate person _____ all his colleagues like to work with.

　　 　A. that　　　　　 B. so　　　　　　 C. which　　　　　 D. as

15. The lecture mainly deals with the trouble young children have _______ right from wrong.

　 　　A. distinguished 　B. distinguishing 　C. to distinguish　 D. to be distinguished