根据句意，用括号中所给单词的正确形式填空。
1. —How old is your son? —He's _______ (nine) years old.
2. It's __________(harm) to your eyes to watch cartoons for hours. Go to have a rest.
3. Your pocket is much bigger than the _________(woman).
4. Don't worry. Peter is a good driver. He always drives_______ (careful) enough
5. We all like the wine because it is ______(make) from grapes.
6. Hard work can bring you _______(success).
7. —Who teaches ______(they) English? —Nobody. They teach themselves.
8. He saw the doctors _______(operate) on his daughter when he came into the room.