17. Polar bears live　　　 on sea ice，which they use as a platform for hunting seals.

　 A. most　　　 B. almost　　　 C. nearly　　 D. mostly

16. ______ , I believe, and you will find Tom is very outgoing.

　 A　 Having a talk with the student　　　 B　 One talk with the student

　 C　 Given a talk with the student　　　 D　 If you have a talk with the student

15. ______ you eat the correct foods ______ be able to keep fit and stay healthy.

A. Only if; will you　 　　　　　　 B. Only if; you will　

C. Unless; will you　 　　　　　　　 D. Unless; you will

14. -Shall we go to the movie tonight?　　　　　　　 　 -No, I'd rather ___ at home with our baby. You'd better not leave it to the babysitter at night. 　A.you stayed　B.you stay　C.stayed　D.stay

13. - Who should be responsible for the accident?

- The boss, not the workers. They just carried out orders ________.

A. as told　 　　　　　　　　　　 B. as are told 　　　　 C. are telling　 　　　 D. as they told

12. I’ll give you my friend’s home address,______ he can be reached most evenings.

A. which 　　　　　　　　 B. when　 　　　　　　 C. whom 　　　　　　 D. where

11. I like getting up very early in summer. The morning air is so good_______.

A. to be breathed 　　　　　　 B. to breathe 　　　　 C. breathing 　　　　 D. being breathed

10. It will not be long before that young journalist _______ me again.

A. will meet　　 B. met　　　　 C. meets　　　　 D. would meet

9. Our house is on the top of the hill，and in winter the winds　　　 be pretty cold．

　 A．need　　 B．can　　 C．must　　　 D．shall

8.Many _______ trees must be planted every year.

A.　　　 thousand　　　 B.thousand of　　　　 C.thousands of　　　　 D.thousands