19. Id rather you ______ something about it for the time being .

　　A. did B. to do

　　此句是结构问题，如果填did，把you did something 看成从句，如果填to do ，则把you 看成了宾格形式，前者正确，后者错误。Would rather 是一个助动词，不可能有宾语复合结构。此题只能选择A。would rather (that) + 从句 （从句中谓语动词用过去时）

　　意思为：宁愿某人做某事。

　　20.Is _________ that flows through that town ?

　　A. this river B. this the river

　　此题正确答案为B。如果选A，句子结构错误。此句是疑问句，把它变成陈述句结构就清楚了，This river is that flows through that town. (无句意)，试比较：This is the river that flows through that town. (这是一条流经那座城镇的河。)

　　21. As is known to all, the problem of pollution is serious.

　　It is known to all that the problem of pollution is serious .

　　前一句是定语从句，后一句是含有主语从句的主从复合句，往往学生搞错这两个结构，以问题形式出现，学生就会暴露出问题。

　　_________ known to everyone , the earth is round .

　　A. It is B. As C. As is D. As it is

　　正确答案是C。

　　22. I need a book , one which is cheap but useful.

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