41. Quite a few people used to believe that disaster ____if a minor was broken．(sure, strike)

was sure to strike

40. ----How do you deal with the disagreement between the company and the customers?

　 ----The key to ____ the problem is to meet the demand ___by the customers．(solve, make)

solving/ made

39. The research is so designed that once ____nothing can be done to change it．(begin)

begun

38. Having a trip abroad is certainly good for the old couple，but it remains ____whether they will enjoy it．(see)

to be seen

37. She will tell us why she feels so strongly that each of us has a role ____ in making the earth a better place to live．(play)

to play

36. Unless ____to speak，you should remain silent at the conference．(invite)

invited　

35. The president’s ____the meeting himself gave them a great deal of encouragement．(attend)

attending

34. Friendship is like money：easier made than ____．(keep)

kept　

33. The man we followed suddenly stopped and looked as if ____whether he was going in the right direction． (see)

to see

32. The manager ____his factory’s products were poor in quality，decided to give his workers further training．(know)

knowing