1. You'd better let in some fresh _____ (空氣).
2. Sue always _____ (分享) things with her friends.
3. There is a long _____ (歷史) behind that building.
4. A little knowledge is a _____ (危險(xiǎn)的) thing.
5. Simon lives on the _____ (第九) floor.
6. The rain has stopped ______（完全地).
7. Eric is so _____ (有禮貌的)! He holds the door open for others.
8. Sandy has lots of _____ (業(yè)余愛(ài)好).
9. They _____ (聊天) until Amy came up the stairs.
10. She has a problem and she wants to know how to _____ (解決) it.