7. Because(A) radio communication had failed(B) once before， I was afraid the men in the plane might be lost(C) touch with(D) the crew on the platform. （TOEFL，1971）
8. When the fire broke out， .
A） the house became emptive.
B） the house had emptive
C） the house had emptied
D） the house was made empty（TOEFL，1980）
9. Volcanoes as active， dormant or extinct.
A） described B） are described
C） being described D） which are described（TOEFL，1980）
10.Most enviromental problems exit because adequate measures for preventing them taken in the past.
A） was not B） were not
C） were not being D） being not（ TOEFL，1977）
11. People will be alert(A) and receptive if they face(B) with information that gets them to think(C) about(D) things they are interested in.
12. The Professor suggests that people in their(A) old age should be engaged(B) in mental and physical activities individually(C) as well as in group(D).
参考答案：
7. C错。应改为might lose。因为无线电通讯以前曾经中断,所以我恐怕飞机里的人也许与月台上的工作人员失去联系。
8. D对。火警发生时,房子已被搬空。
9. B对。火山被描述为活的、沉睡的或者是死的。
10. B对。大多数环境污染问题的存在,是因为过去没有采取适当的保护措施。
11. B错。应改为are faced。人们对某些事情有兴趣,当面对那些使得他们思考这些事情的信息时,他们会很警觉,接受力也强。
12. B错,应改为engage。教授建议老年人应该不仅集体地,而且个别地参加精神的和体育的活动。
