15. There’s about 400mm rain fall in this area a year _____

A. on average　 B. in average　 C. of average　 D. for average

14. You must officially ____ any course you are not attending.

A. fall　 B. drop　　 C. learn　　 D. join

13. Do be careful next time, _____?

A. will you　　 B. do you　　 C. don’t you　　 D. aren’t you

12. There _____ a tall tree in front of the building over there, didn’t there?

A. was　 B. would be　　 C. must be　 D. used to be

11. He is a man of _______ and he had a lot of interesting _______ in his life.

A. much experience, experiences 　B. many experiences, experience

C. much experience, experience 　　D. many experiences, experiences

10. It’s a pity that you missed _____ the chance to go abroad for further education.

A. to give　　 B. to be given　　 C. giving　　 D. being given