介词填空，根据句意填入一个正确的单词。
1. Amy is sitting ______Cara and Doris.
2. Go ______ the street, and you will see the bookstore ______ the right.
3. Do you help ______ home?
4. We go ______ the bakery when we walk to school.
5. Danny has written the way ______ a piece of paper.
6. There's a school ______ our house.
7. I'll put my letter ______ an envelope and post it.
8. I like to play hockey ______ winter.
9. He is pointing ______ the right.
10. The wind blows the clouds ______ the sky.
