69. Our teacher warned us not to touch the chemicals in the lab. (改为被动语态)

　　 We 　　　　　　　　　　　not to touch the chemicals in the lab.

68. He doesn’t know how he can solve the problem. (改为简单句)

　　 He doesn’t know 　　　　　　　　　　　solve the problem.

67. She has been here since the beginning of last month. (对划线部分提问)

　　 　　　　　　　　　　　has she been here?

66. Peter seldom goes to work by bicycle on rainy days. (改为反意疑问句)

　　 Peter seldom goes to work by bicycle on rainy days, 　　　　　　　　　　?

65. Judy decided to buy a new calculator. (改为否定句)

　　 Judy 　　　　　　　　　　to buy a new calculator.

64. The No.2 underground has reached Xujing. It helps us travel to Shanghai 　　　　. (quick)

VII. Rewrite the following sentences as required. (按要求改写句子，每空一词)：(共12分)

63. Our new flat is on the 　　　　　floor. We go up and down by lift every day. (twelve)

62. 　　　　　is more important than anything else. (healthy)

61. Sometimes toys can really make the children 　　　　　　. (happily)

60. The bicycle doesn’t belong to　　　　 . It’s mine. (she)