1. 用方框中所给单词的适当形式填空。

why    hour    useful    finish    he

1. （1） — is he late for class?

   — I don't know.

3. （2） John is not good at English. Can you help ?
5. （3） I think history is in our life.
7. （4） After Sally her homework, she takes a walk along the river.
9. （5） We play football on the playground for three .