根据所给英文写出单词的合适形式。

1. Lily is a good            (swim) because she is the first in the swimming match.

2. We usually brush our teeth            (two) a day .

3. I have a little dog .             (it) nose is white.

4. How long do you spend            (chat) with your e-friends on the Internet every day?

5. Fruit and vegetables are             (health) food.