根据句意用介词填空.
1.look____the blacboard and listen____me.
2.who is____duty today?
3.look!a cat is____the tree.
4.give me some cups____drink.
5.what's wrong____you,dad?
6.what's____this red bag?
7.the bike____the tree is hers.
8.it's time____bed.
9.the broom is____the door.so i can't see it.
10.i have two eggs and noodles____breakfast.