单句语法填空

1．They were talking             a whisper.

2．American pop music has been            (export) around the world.

3．Close the window and keep the mosquitoes(蚊子) out of the room or you will get             (bite)．

4．A team of nurses assisted the doctor             performing me operation.

5．If Mr Dewey had been present, he would have offered any possible             (assist) to the people there.

6．The             (assist) impressed on/upon me the importance of immediate action.

7．This produced             chain reaction, which made it possible for life to develop.

8．As far as I know, more and more people have realized smoking does great harm             health.

9．He may say no, but there is no harm            asking.

10．She was very tired.           ,_she didn't give the market report.