16. --How often do you go to the library?--______.
A. In two days B. Every few days
C. Each third day D. Every a few days
17. We are just _____ calling you up _____ you come in.
A. about; when B. on the point of; while
C. on the point of; when D. on the point of; as
18. --They all agree _____ George. Has the project been passed?
--Who _____ George can make the final decision?
A. except; expect B. except; besides
C. but; but D. besides; but
19. I come to tell you Jack _____ for London next month.
A. is leaving B. is about to leave
C. will leave D. would leave
20. You can say "He went there _____, not _____."
A. on the car; by car B.on foot; in his car
C. by foot; by car D.in his car; by his foot
21. Jack is a good friend _____, he often comes to our home for a visit.
A. of my father B. of my father's
C. for my father D. with my father
22. What way are you thinking of _____ rid of the flies?
A. to get B. getting
C. being got D. to be getting
23. We must do something to _____ factories _____waste water into the river before it is cleaned.
A. stop; pouring . B. prevent; to pour
C. keep; pouring D. stop; to pour
24. "_____ of them are not here." means "_____ of them are not here."
A. All; Some B. Both; Every C. Both; Neither D. All; Both

16.D. Every a few days 每隔几天（我要去一趟图书馆）

17.C. on the point of , when 你进来时，我们正要打电话给你。

18.C. but , but 除了乔治，他们都同意了，那项目通过了吗？
可乔治是最后拍板的人哪。

19.B. is about to leave 我来告诉你，杰克下个月要去伦敦。（be about to do ......表示计划中要做的事。）

20.B. on foot , in his car 你可以说“他是步行去那儿的，不是坐车”

21.B. of my father's 杰克是我父亲的好朋友（之一）.......如果选 A. of my father , 则应将 a good freind 改成 the only one freind （唯一的好朋友） 这也不切实际。

22.A. to get 你在想什么方法除掉苍蝇？
如果感觉不太好理解，可以把原句改写一下： To get rid of the flies, what way are you thinking of ?

23 A. stop , pouring 我们一定要采取措施阻止废水在没处理之前流如河流。

24.D. All , Both 注意后一句的谓语动词是 are （复数），所以不能选 B. Both , Every