一、用it + … + to do句型翻译下列句子。
1. It’s very important to have some close friends.
2. It’s very important to be polite to others.
3. It’s really interesting to study the languages and cultures of other countries.
4. Is it hard to learn a foreign language?
5. It’s hard to get real friends.
6. It’s important to be honest.
7. It’s impossible for fish to live without water.
8. It’s necessary for students to do more exercise while learning English.
9. It’s necessary for teachers to be patient with students.
10. It’s impossible for people to stare directly at the sun.
二、用所给动词的适当形式填空。
11. to sing
12. work
13. die; surrender
14. to love
15. change
16. play
17. escape
18. to go
19. flying; doing; chatting, speaking
三、单项选择。
20. A　21. B　22. A　23. D　24. D　25. A　26. B　27. C
28.C　29.B　30.A　31.A　32.A　33.B　34.C　35.B
36.B　37.A　38.A　39.B　40.B　41.B　42.A　43.C
44. A