64. 他经常怀疑是否值得如此勤奋学习。

　 He often doubts whether ______________________________　　　　　 .

63. 你能否向我解释一下，为什么我的电脑经常出故障？

　 Can you explain to me　　　　　　　　　　　　　　　　　　　　　　　　 ?

62. 与地震相比而言，近来核泄漏对日本人产生更坏的影响。

　Compared with the earthquake , the nuclear leak 　___________　 　the people in Japan recently.

按所给的汉语，用英语完成下列句子，并将答案写在答题卡标有题号的横线上。

61.当我们气喘吁吁赶到那里时，记录影片已经开始了半小时。

　 When 　　　　　　　　　　　　　　　　, the documentary had been on for half an hour.

60. –Did you see him come in just now?

　 --No, I 　　　　　　　　　(type) a letter all the time.

59. Mr. Green told me that his family 　　　　　　　　(go) for a holiday the next week.

58. How soon do you think we 　　　　　　　　　(get) to the hotel?

57. With all lights on, the hall ________ (become) as bright as day when we arrived.

56. We should try our best to prevent the air pollution 　　　　　　　　(live) a happy life.

55. Everyone knows that the disabled mustn’t __________ (laugh) at