根据句意、汉语或首字母提示以适当形式填写正确的单词。

1. You'd better let in some fresh _____ (空气).

2. Sue always _____ (分享) things with her friends.

3. There is a long _____ (历史) behind that building.

4. A little knowledge is a _____ (危险的) thing.

5. Simon lives on the _____ (第九) floor.

6. The rain has stopped ______（完全地).

7. Eric is so _____ (有礼貌的)! He holds the door open for others.

8. Sandy has lots of _____ (业余爱好).

9. They _____ (聊天) until Amy came up the stairs.

10. She has a problem and she wants to know how to _____ (解决) it.