根据首字母或汉语提示写单词,完成句子。
1. Your book is u_____ the desk.
2. My books are on the c_____.
3. —Where is your pen?
    —Sorry, I don't k_____.
4. Can you b_____ your notebook to school?
5. I n_____ a bag.
6. His notebook is in the _____ (抽屉).
7. Cindy's _____ (数学) book is on the bed.
8. Is the notebook on the _____ (沙发)?
9. My pencil is on the _____ (课桌).
10. Here is your brother's _____ (房间).

根据句意和首字母提示完成单词。