根据国务院颁布的《城市规划条例》的规定，我国大、中、小城市是以（）作为划分标准的。

A.城市占地面积

B.公安部门登记在册的非农业正式户口人数

C.城市的行政级别

D.城市的经济状况

用括号内所给动词的适当形式填空。

1. The twins ________ (be) at school yesterday.

2. Look! The dog ________ (lie) on the sofa.

3. I like playing football. That makes me ________ (feel) happy.

4. Would you like ________ (play) tennis with me?

5. I went to a supermarket yesterday and found a little girl ________ (cry)

    in the corner because she couldn't find her mother.