根据句意及汉语提示完成下列句子

1. Grace____   ____  （必须）wear her____  （制服）to school every day.  

2. My father bought a pair of____   ____  （运动鞋）for me yesterday.

3. We have three____   ____  （体育课）every week.  

4. 1t is warm in the room but cold____  （外面）.  

5. What are the____  （规定）at your school?

微观检验在（）倍显微镜下观察金属的显微组织。

A.5-40

B.50-100

C.100-1500

D.2000-10000