34. The research is so designed that once ____ nothing can be done to change it.

　A. begins　 　　　 B. having begun

　C. beginning　　　　 D. begun

33. It is said in Australia there is more land than the government knows ____.

　A. it what to do with　 　B. what to do it with

　C. what to do with it　 　D. to do what with it

32. Having a trip abroad is certainly good for the old couple, but it remains ____ whether they will enjoy it.

　A. to see　　　 　　 B. to be seen

　C. seeing　　　 D. seen

31. We thought of selling this old furniture, but we've decided to ____ it. It might be valuable.

　A. hold on to　　 　B. keep up with

　C. turn to　 　　 D. look after

30. John shut everybody out of the kitchen ____ he could prepare his grand surprise for the party.

　A. which　 　　 B. when

　C. so that　　 　　D. as if

29. I wonder why Jenny ____ us recently. We should have heard from her by now.

　A. hasn't written 　　 B. doesn't write

　C. won't write　 　 D. hadn't written

28. The taxi driver often reminds passengers to ____ their belongings when they leave the car.

　A. keep　　 　　　 B. catch

　C. hold　　　 　　 D. take

27. Boris has brains. In fact, I doubt whether anyone in the class has ____ IQ.

　A. a high　　 　B. a higher

　C. the higher　 D. the highest

26. Jumping out of ____ airplane at ten thousand feet is quite ____ exciting experience.

　A.不填; the　　 B.不填; an

　C. an; an　 　 　　　 D. the; the

25. -Is John coming by train？

　 -He should, but he ____ not. He likes driving his car.

　A. must　 　　　　　 B. can

　C. need　 　　　　　　 D. may