根据句意，用括号内所给单词的适当形式填空。

1. What does the passage ________(main) talk about?

2. My pet cat likes to keep clean. Look, it is washing ________(it) now.

3. We are in ________(agree) that fruit and vegetables are good for our health.

4. We had a ________(discuss) about the differences between Britain and the US.

5. People who eat a balanced diet should be ________(healthy) than those who only eat fast food.