61. 迈克敲了敲门，但没有回应。

Mike 　　▲　 　the door, but there was no answer.

60. My sister 　　▲　 　(be) a singer since she left the school.

59. We’ve worked for a long time. Let’s stop　　 ▲ 　　(drink) some water.

58. I 　　▲　 　(not go) to bed until my mother came back at ten last night.

57. Have you read 　　▲　 　(today) newspaper?　

56. A computer is 　　▲　 　(expensive) than a TV set.　

55. -How many 　　▲　 　(tooth) does a dog have?

　 -Sorry, I have no idea. Let’s search on the Internet.

54. We should speak to the old man 　　▲　 　(polite).　　

53. Playing too many computer games is 　　▲　 　(harm) to you.　

52．　 ▲　 (幸好)，she was in when I called．

B) 根据句意，用括号中所给单词的适当形式或句子的语法要求填空。