根据句意选择下短语填空,有的需要变换形式.
clean up,wash up,wash one's hands,on the road,do one's homework
1.It took me three hours to _____ my room.
2.Zhang Ming often ____ till very late at night,so he feels very tired.
3.It's very dangerous to play football ______.
4."______ before eating." the teacher said to the children.
5.I often help my mother _____ the dishes after supper.
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