34. Nuclear science should be developed to benefit the people ____ harm them.

A. more than　 B. other than　 C. better than　 D. rather than

33. To make their crops _____ better, many farmers use computers to control the ____ conditions of vegetables and plants.

A. grow; grow　 B. grow; grown　　 C. grown; growing　 D. grow; growing　

32. - Elisabeth had a birthday party yesterday. Did you go to her party?

- No. I ____. Did you have a good time?　

A. was not invited　 B. have not been invited　 C. hadn’t been invited　 D. didn’t invite

31. As we all know, Gibert _____ electricity, but Edison _____ the light bulb.　　　　　　　　　　

A. discovered; found　　　　　 B. discovered; invented　

C. invented; discovered　　　　 D. found; invented

30. I threw myself ____ the Spanish classes and after three months I could carry on a simple conversation.

A. to　 B. on　 C. into　 D. away

29. Miles can be ____ to kilometers by using a simple mathematic formula.

A. converted　 B. connected　 C. exchanged　 D. transported

28. Because of the environment is getting worse and worse, a large ______ of desert _____ has covered the farmland.

A. number; has　 B. quantity; has　 C. number; have　 D. quantity; have

27. A trainer attached two baskets _____ two poles and began the interesting game.

A. with　 B. to　 C. in　 D. on

26. - What about the price of petrol now?

- It has been ______ 20 percent since the beginning of this year.

A. increased to　　 B. risen by　　 C. increased by　　 D. risen to　

25. After numerous experiments, some doctors have made a _____ in the treatment of cancer.

A. breakdown　　　　　 B. breakup 　

C. breakthrough　　　　 D. breakout