29. - Did Frank call you yesterday?

　 - Yes, but I would rather he _________.

　 A. not　　　 B. wouldn’t　　 C. didn’t　　 D. hadn’t

28. Bamboo is a(n) _______ of great potential and a very strong material as well.

　 A. source　　 B. origin　　 C resource　 D. brand

27. ---I hope that you can remove the difference between you and Susan and become good friends.

　 ---______. If only Susan had the same idea.

A. By no means　　　 B. It’s a pleasure　　　 C. By all means　 　D. My pleasure

26. To work from home, which one could hardly imagine, has been made ______ with the development of computer technology.

　　 A. it possible 　　　　B. possible　　　 C. possibly　　　　 D. to be possible

25. Feeling more and more pressure from the environment ______, the government has decided to close down the factories pouring out poisonous chemicals.

　　 A. polluted　　 B. having polluted　 　C. being polluted 　D. having been polluted

24. There was a loud explosion in the street. ______ from the stores to see what had happened.

　 　A. Out rushed people　 　B. Out people rushed 　C. Rushed people out　 D. Did people rush out

23. 31. The secretary was allowed ten more minutes. She ______ her boss’ patience and tried to hurry.

　 　A. realized 　　　　B. tolerated　　　　 C. sensed　　　　 D. understood

22. Ladies and gentlemen, due to an unexpected accident, one of the singers whom all of you ______ to hear ______ tonight.

　 　A. came; wouldn’t perform　　　　　 　　　　B. come; won’t perform

　 C. had come; don’t perform　　　　　　　　　 D. have come; won’t be performing

21. Talking about his success, the famous scientist said, “ I’ve been lucky ______ there are many people who have helped me.”

　 A. provided that　　 　　B.　 in that　　　　 C. so that　　　　 　D. now that

20. The United States is trying to ______ the serious problems resulting from the energy crisis.

　 A. step up 　　　　B. cut off 　　　　C. cope with　　　　　 D. end up