用括号中单词的适当词形填空。

1. Help             (you) to some soup, boys and girls.

2. The weather today is even ______ (bad) than yesterday.

3. Help yourselves to some fish. It's so ______ (taste).

4. Where will you choose             (sit) on the bus?

5. She is shorter but ______ (slim) than me.

当机械通风系统采用部分循环空气时，送入工作场所空气中有害气体、蒸汽及粉尘的含量，不应超过规定的接触限值的30%。