1. 用方框中所给短语的适当形式填空

be ready for    be busy with    can't help but    do with    change one's mind

1. （1） Once you decide，you'd better not .
3. （2） I don't know what I'll the problem.
5. （3） It's 8：00 in the morning.Weclass.
7. （4） We the Spring Festival these days.It is important in China.
9. （5） She laugh when her brother told her the joke.