根据句意及首字母补全在本课中出现的单词。

1. E_____ in our class can help each other.

2. In the early morning,the air is very f_____ .

3. It's a h_____ store,We can't move it.

4. We should o_____ a club to collect the paper.

5. Please b_____ your stamp collection to school.

挤塑聚苯乙烯泡沫塑料产品以不超过（）m³为一批。

A.100

B.200

C.300

D.400