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

45. The teacher __________ it was important to know English grammar.

A. had always been saying　 　　　　　　　 B. was always saying

C. had always had said　 　　　　　　　　　　 D. was always said

44. "I heard you talking to somebody just now." "Oh, I __________ to myself."

A. have only talked　　　 　　　 B. only talk 　 C. was only talking　　　　 D. have only been talking

43. James has just arrived, but I didn't know he __________ until yesterday.

A. will come　 　　　　　　 B. was coming　 　　 C. has been coming　 　　 D. comes

42. When I arrived in Birmingham the sun __________.

A. has been shining　　　　　　　 B. shone　 　　　　　　 C. has shone　 　　　　　　　 D. was shining