(   ) 11. She will be a teacher___________ two months.

A. on     B. after      C. in       D. at

10. I think cities in 50 years will be big and______________ (crowd).

9.   We all should play a part in_____________  (keep) our school clean and tidy.

8.   With__________   (little) pollution,our planet will become greener and our health will be better.

7.   The water___________ (pollute) in his country is still a big problem.

6.   Maybe his__________ (predict) can come true one day.

5.   Farmers are going to____________ (種植)flowers around the pool.

4.   Have you got any plans about your_____________ (將來)?

3.   The young man grew up in a good home______________ (環(huán)境).

2.   Will people be able to live on other_____________   (行星)？