根据句意及首字母或汉语提示完成句子。

1. Please don't w _____ water. Can't you see the sign "Save Water"?    

2. Many students think that teenagers should be a _____ to choose their own clothes.    

3. We will be the masters of the 21st c _____.    

4. I w _____ if you can give me a hand.

5. —Thank you very much for helping me with my homework.      

    —It's my p _____.

6. Lucy and Lily are twins，so they are s _____ in many ways.

7. The teacher had talked with the students w _____ homework hadn't been handed in.

8. I like m _____ who play different kinds of music.    

9. The man won a m _____ pound in the game.

10. Are you afraid of f _____ in an airplane?