选词填空。
a an in at about
1. How_______ my uncle?
2. Is he interested _______ flying kites.
3. I see _______ old man .
4. There is _______ small goat.
5. I have lunch _______ 12:00.
6. I am wearing _______ thick coat.
7. I am_______ Beijing.
8. I have _______ apple.