5. I don't think ____ possible to master a foreign language without much memory work.　 (NMET 1990)

A. this　　 B. that　　 C. its　　 D. it

　　 [交际速成]

4. ____ the meeting himself gave them a great deal of encouragement. (2003 上海)

A. The president will attend

B. The president to attend

C. The president attend

D. The president's attending

3. When ____, the museum will be open to the public next year. (2002 上海春招)

A. completed　　　　　　 B. completing

C. being completed　　　　 D. to be completed

2. The English play ____ my students acted at the New Year's party was a great success. (2004 全国卷I)

A. for which　　　　　　 B. at which

C. in which　　　　　　　 D. on which

1. The reason ____ you failed, I think,　 was ____ you had turned a deaf ear to your mother's advice.

A. that; because　　　　 B. why; because

C. why; that　　　　　　 D. for that; that

2. Not only / just…but (also) 连接相同的句子成分

Not only the teacher but all the students are going to visit the Science Museum. (连接主语时根据就近原则) / They not only sang but (also) danced for a whole night. / Many people go to see this film not just because the film is interesting, but also the leading actors and actresses are all world famous. / Not only do we learn for our country, but we'll work for her in the future. (连接句子时，not only后的句子要部分倒装)

[牛刀小试3]

1. When / While / Though / Unless / If + n. / adj. / 现在分词／过去分词……

状语从句有些成分有时可省略，一般是主语和be省略；有时it和be可以省略： He made no answer when (he is) spoken to. /Though (he was) born in Chicago, the author is most famous for his stories about New York. / Come back early if (it is) possible.

[注意]用法详见Chapter 10语法活用“省略和插入语”。

3. It + be + PP. to do sth

[考例](2001上海) In fact ____ is a hard job for the police to keep order in an important football match.

　　 A. this　　 B. that　　 C. there　　 D. it

[考查目标] 形式主语。

[答案与解析]D　 只有it才可以作形式主语。

[句型归纳]

1. It + be + adj. + to do sth　 2. It + be + n. + to do sth

5. It's polite to finish eating everything on your plate, so don't take more food than you need. 餐盘里的东西要吃光才礼貌，所以不要多拿。

该句中的it为形式主语，真正的主语为to finish eating …例如：It's not right to tell lies. 撒谎是不对的。

it作为形式主语，真正的主语是动词不定式短语。常见的句型有：