55. By eleven o'clock yesterday, we __________ at the airport.

A. had arrived　 　　 B. have arrived　 　　　　　 C. shall arrive　 　　　　　　 D. arrive

54. While I __________ my breakfast the morning post came.

A. had had　 　　　　 B. had been having　 　　 C. was having　 　　　　　　 D. have had

53. When I reached the station, the train __________ already __________.

A. had ... left　 　　 B. were ... leaving　 　　 C. was ... left　 　　　　　　 D. had ....been left

52. It was December 20. In five days it would be Christmas Day. The Lord Mayor , together with overseas students, __________ to celebrate it .

A. was going　 　　　 B. will go　 　　　　　　　　 C. is going　 　　　　　　　　 D. went

51. The singer had lived in California before he __________ university.

A. would return　 　 B. had return　 　　　　　　 C. will return　 　　　　　　 D. should return

50. The singer had lived in California before he __________ university.

A. had been sent　 B. had been sending　 　 C. was sending　 　　　　　 D. was sent

49. As soon as John's mother __________ out, he stole some food.

A. goes　 　　　　　　　 B. had gone　 　　　　　　　 C. was going　 　　　　　　 D. were going

48. When we got to the airport, we found that the plane __________.

A. had already taken off　 　　　　　　　　　　　　 B. already took off

C. was already taken off　 　　　　　　　　　　　　 D. was already taking off

47. By the end of last term, We __________ 2, 500 words.

A. had learned　 　　　　　 B. has learned　 　　 C. has been learned　 　　 D. learned

46. As he __________ I couldn't ask him anything.

A. will already left　 　　　　　　　　　　　　　 B. have already left

C. had already left　 　　　　　　　　　　　　　 D. already leaves