12. The only way to _______ (治愈) backache is to rest.

11. It was clever of you to ________ (解决) the problem.

10. Something serious is _________ (happen) to me.

9. That easy chair takes up too much _________ (room).

8. How long does it take you _________ (walk) 50 meters?

7. You should protect the children from _________ (catch) cold.　

6. Those poor children need somewhere ________ (live).

5. The population of this city __________ (be) not large.

3. The number of population _________ (increasing) quickly.

3. I have an a_______ with my doctor this afternoon.