31. They did not discover until later _____ the car had been destroyed.

　　A. as B. than

　　C. which D. that

　　32. They overcame all the difficulties and fulfilled the plan ten days ahead of schedule, _____ was something we had not expected.

　　A. that B. this

　　C. it D. which

　　33. That’s the reason _____ Ann could not do her part of the job.

　　A. that B. of

　　C. because D. why

　　34. The company official _____ I thought would be fired received a raise.

　　A. whom B. whoever

　　C. who D. of whom

　　35. In 1990 he caught a serious illness from _____ effects he still suffers.

　　A. that B. which

　　C. what D. whose

　　36. His brother had become a teacher, _____ he wanted to be.

　　A. who B. what

　　C. which D. that

　　37. _____ I saw was two men crossing the street.

　　A. What B. Whom

　　C. Who D. That

　　38. The time will come _____ man can fly to outer space freely.

　　A. that B. when

　　C. in that D. what

　　39. Before her marriage, she spent a considerable time in that very part of Shanghai,_____ she belonged.

　　A. which B. to where

　　C. to which D. at which

　　40. The United States is composed of fifty states, two of _____ are separated from the others by land or water.

　　A. them B. that

　　C. which D. those

　　41. Crude oil is refined in a refinery, _____ makes it possible to get many grades of oils for different uses.

　　A. as B. that

　　C. this D. which

　　42. I am sure that _____ you said is wrong.

　　A. which B. all

　　C. this D. how

　　43. He arrived late for the tea party, _____ made us all very disappointed.

　　A. which B. this

　　C. it D. that

　　44. The people at the party were worried about John because no one was aware _____ he had gone.

　　A. where that B. where

　　C. of the place where D. the place

　　45. Is there anyone you can think of _____ may know her address?

　　A. which B. that

　　C. who D. what

　　46. It was raining, _____ was a pity.

　　A. what B. that

　　C. as D. which

　　47. This is the reason _____ an aeroplane can’t fly in space.

　　A. which B. why

　　C. where D. for that

　　48. We’ve tested three hundred types of boot, _____ completely waterproof.

　　A. no of which B. none of which

　　C. some of that D. neither of which