1. 选择正确的单词完成句子。

on     under    at   in    to

1. （1） Put the chairs the room.

3. （2） Where's the apple? It's the tree.

5. （3） I can't see my ruler. Where is it? It's the book.

7. （4） Look your hands. They are small.

9. （5） Listen the ducks. Quack, quack.