用所给词的正确形式填空。
1. Why is cold water                   (help) to treat a small burn?
2. This car can run by                   (it), so it’s very expensive.
3. Something is wrong with him. He looks                   (worry).
4. Some students don’t know the                (important) of learning English well.
5. Brian enjoys                   (sell) cookies. 
6. We won’t play football if it                   (rain).
7. --- I don’t know what to wear to the party?
--- If I                   (be) you, I’d wear a shirt and tie.
8.                    (friend) is more important than money between friends.
9. Children should go to bed before ten every light, or they will be __ ___ (sleep) in class.
10. A good                   (listen) will help you a lot when you study.