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.