用所给单词的适当形式完成句子。

1. I need to do my homework more ___     (care).

2. You should eat it ___     (little) often.

3. He            (give) up junk food.

4. _____ (do) exercise is good for everyone.

5. Try _____ (not sleep) late at night.

在化工生产中，转子流量计前通常加（）。

A.分离器

B.降压器

C.流量计

D.过滤器