17. There are many      (wolf) in the zoo.

16. Forests can help prevent water from      (run) away,so drought doesn't often happen in this area.

15. People in the city held a great party to celebrate their v      

14. In ancient China,people can tell the time from the p      of the sun.

13. Some students are having physics class in the l      

12. Its very cold outside. Please put on your c      when you go out.

11.1 don't know how to e      my thanks to you for your help.

(   ) 10. —-Look!The man at the gate           be our teacher. He is always standing there every morning.

--No,it       be him. He is having a meeting in the office now.

A. must;can't B. must;mustn't

C. can't;can't D. can;can't

(   ) 9. The girl is talented in       singing dancing，so she was chosen to per-

form at the Spring Festival Gala.
A. either;or B. not only;but also

C. neither?or D. either;nor

(   ) 8. --_________ bookcase is this?

   -It must be      

A. Who's;Tom B. Who's;Tom'

C. Whose;Tom's D. Whose;Tom