1. 用方框中所给单词或短语的适当形式填空

be careful about       influence     health    be able to    characteristic

1. （1） — Who has you most?

   — My father.

3. （2） We should eat less meat and more vegetables to keep.
5. （3） The main of the boy is smart and hardworking.
7. （4） You must how the machine works.
9. （5） — you swim?

   — Yes, I am.