33. ______ halfway through the exercise, the teacher changed his mind and collected all our papers.

A. When only being　　　　　　　　 B. When we were only

C. Being only　　　　　　　　　 　 D. Having been　

32. It was purely ______ chance that the mistake was discovered.　 ^{Blog/?UserId=997609}

A. in　 　　　　　B. for　 　　　　　　C. by　　 　　　　 D. from　　　　　　　　　　　　

31. I didn’t mean ______ anything, but these apples looked so good I couldn’t resist ______ one.

A. to eat…trying　　　　　　　 B. to eat…to trying　

C. eating…to try 　　　　　　　　　 D. eating…to trying　

30. “I know she was in because I heard her radio, but she didn’t open the door.” “She ______ the bell.”

A. may not be hearing 　　　　　 B. may not have heard

C. must not have heard　　　　　 D. must not be hearing　　　　　　　　　　

29. If city noises　_______　from I ncreasing, people______ shout to be heard even at the dinner table 20 years from now.

A. are not kept; will have to　　　　 B. are not kept; have to

C. do not keep; will have to　　　　 D. do not keep; have to　　　　　　

28. ----Come on, please give me some ideas about the project.

　 ----With so much work filling my mind, I almost ______.

A. break up　　 　B. break out　　 　C. break down　 　　D. break off

27. _______about wild plants that they decided to make a trip to Madagascar for further research.

A. So curious the couple was　　　　　 B. So curious were the couple

C. How curious the couple were　 　　 D. The couple was such curious　

26. If there were no examinations, we should have ___ at school.　

A. the happiest time　　　　　 　　 B. a more happier time　

C. much happiest time　　　 　　　　 D. a much happier time　　　　　　

25. Stop making so much noise __________ the neighbor will start complaining.

A .or else　　 B .but still　　　　　　　 　 C. and then　　　 D. so that　　　　

24. -How are you doing all these years, Jim?

　 -Nothing new. Everything is going on _______ it was years ago.

A. as　 　　　　　　 　B. while　　　 　　　　 C. when　　 　　D. since