根据句意及首字母提示补全单词，使句意完整。

1. Look at the map, can you s_____ China on it?

2. A panda (熊猫) is b_____ and w_____.

3. W_____ to our store.

4. He can't a_____ a new house.

5. He w_____ a yellow car.

6. There are many clothes on s_____.

7. You must do your things y_____.

8. I can't work out the math problem (问题), could you give me an e_____?

9. The store has shoes at a very good p_____.

10. E_____ of the students in our class has an English dictionary.

用树型结构表示实体之间联系的模型是______ 。

A．关系模型

B．网状模型

C．层次模型

D．以上三个都是