63. 我认为用毯子扑灭火是个好方法。

I think it’s a good way to 　　▲　 　the fire with a blanket.　　

62. 昨天这位医生为病人做手术了吗？

Did the doctor 　　▲　 　the patients yesterday?　

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. You need 　　▲　 　(return) the comic book to the library at once.

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).