用before, after, when, while, since, until, as soon as或whenever填空。
（1）、 Xiao Yueyue was sent to hospital, many people tried to save her.
（2）、The little girl didn't stop crying she found her mother.
（3）、 we are away, our baby is looked after by my mother.
（4）、I have been collecting stamps I was nine years old.
