1. We were working in the fields ______ (当天开始下雨时) .
2. Mike got up ______ (他一听到铃声).
3. She went to bed ______ 她完成作业后)
4. He didn't go home ______ (直到他看到) his father.
5. Don't forget to check your homework ______ (在你上交之前).