1. 根据语境从方框中选择恰当的短语填空，有的需要变换形式。

by accident，on time，be busy, fight with，depend on，say goodbye to

1. （1） The doctor asked him to take medicineevery day.
3. （2） We'll leave for London tomorrow. Let's go andour teachers.
5. （3） Don't alwaysothers. You should do it by yourself.
7. （4） I met Tim at the airport. He looked very young.
9. （5） The boy alwaysother children，so he has no friends.
11. （6） There will be a sports meeting in our school next week. The studentsgetting ready for it.