用括号内所给单词的适当形式填空, 每空一词。

1. Air is a            (mix) of gases.

2. He            (seek) shelter from the rain yesterday.

3. She is very              (religion) and goes to church three times a week.

4. No one may enter or leave without              (permit).

5. Smoking can be              (harm) to your health.

6. This project is of great              (benefit) to everyone.

7. I don't know of anything to prevent you              (do) so.

8. The boy sat there,            (stare) at the teacher on the stage.

9. It exploded              (violent) with fire so no one dared to go close.

10. Theory must be              (combine) with practice.

高处作业人员在作业前应充分了解作业内容、地点(位号)、时间、要求，熟知作业中的危害因素和“高处作业许可证”中的安全措施。