17. ______is known to all that Taiwan is a part of China.

A. It　　　 B. This　　 C. That　　 D. Which

答：A。it为形式主语，真正的主语为that从句。

16. Her uncle has moved to Beijing and does not live with her. ________ her mother.

A. Neither does 　　B. So has　　

C. Nor has　　 　　　D. So it is with

答：D。表示“某人也……”时，当苗句中含不同的谓语动词，用so it is with ....或It is the same with...句式。

14. I find ______ simple to learn to drive a car.

A. its　　　 B. it　　　 C. he　　　 D. him

答：B。it为形式宾语。

I5. It is nearly half a century________ the first computer was invented.

A. since　　 B. when　　 C. that　　 D. until

答：A。it指时间。

13. ________In summer the weather is terribly hot in Nanjing.

A. Soisit　　 B. Soitis　　 C. Itisso　 　D. ltsois

答：B。it指天气。强调同一件事不用倒装。

12. Is ______necessary to tell his father everything?

A. it　　　 B. that　　　 C. what　　 D. he

答：A。it用作形式主语。

11. It takes the spaceship more than three days to ______ the moan.

A. to send　 　　B. being sent　

C. to be sent　 　　D. sending

答：C。讧是形式主语，真正主语是不定式，此处应用不定式的被动式。

10. It’s no good _________ today’s work till tomorrow.

A. to put off　 　B. putting off　

C. put off　　 　　D. to be put off

答：B。it是形式主语，在It is good (use)句型中，真正主语用动名词。

9. - ________Who is there?

- ________Helem

A. She’s　　 B. That’s　 C. It’s　　 D. There’s

答：C。it指人

8. It’s time_________ the table for dinner.

A. to pull　　 B. to lay　　 C. preparing　 D. putting out

答：B。不定式傲真正的主语。It’s time for+名词或It time to do ....

7. ________ bad mumers to laugh at people when they are in trouble.

A. It is　　　 B. There are　

　C. That’s　　 D. These are

答：A。it为形式主语。