用括号中的动词适当形式填空。

1. I let him ________ (go) early as he wanted ________ (meet) his uncle at the station.

2. Will you help me ________ (move) the bed?

3. If he doesn't know how ________ (use) the recorder, you'd better ________ (show) him.

4. He is the last one ________ (leave) the office every day.

5. It's bad manners ________ (shout) in public.

6. The boy is old enough ________ (dress) himself.

7. She is too ill ________ (go) to school.

职业性有害因素是指（）

A.生产工艺过程中存在的有害健康的各种职业因素

B.劳动过程中所有能对健康产生不良影响的职业因素

C.不良劳动条件下存在的能对健康产生不良影响的职业因素

D.生产环境中存在的能对健康产生不良影响的职业因素

E.以上都不是