41. If a metal bar is heated, the greater the heat ____, the larger the expansion.

A. applied B. being applied C. applying D. is applied

42. They did not discover until later____ the car had been destroyed.

A. as B. than C. which D. that

43. He has already made up his mind. It's no use ____ him.

A. try to persuade B. trying to persuade

C. to try to persuade D. to try persuading

44. It is much easier to talk about social change than____.

A. to bring it about B. to bring it on C. to bring it up D. to bring it out

45. ____ seems easy in theory seems difficult in practice.

A. That B. With C. What D. It

46. The house is dark; the Browns_____ to bed.

A. may go B. should go

C. should have gone D. must have gone

47. This is a mistake which is typical ____ beginners.

A. for B. of C. to D. with

48. There may be, somewhere outside the solar system, intelligent life ____ messages to us.

A. sends B. sent C. sending D. has sent

49. Please be sure to telephone me the next time you____.

A. will ***e B. would ***e C. shall ***e D. ***e

50. All the machines____ by the end of the following week.

A. were repaired B. will be repaired

C. have been repaired D. will have been repaired

答案：

41-45 ADBAC 46-50 DBCDD