It is important that the boy （ ） an adult to take care of him.

In the swamp the army （ ） by mosquitoes.

I think it’s high time we _____ strict measures to stop pollution.

Such a skilled tennis player knows how to take_____of his opponent’s (对手) chief weakness.

No one should blind himself （ ） the well-known fact.

There was so much noise that the speaker couldn’t make himself _____.

Frankfurt, Germany, is one of the most （ ） populated regions in Western Europe.

（ ） when she started complaining.

I （ ） the instant coffee if it’s all you’ve got.

It was only by a great effort of will and courage that he was able to （ ） himself together.

I wrote it down_____I should forget it.

To be frank, （ ） is a great relief to have the task fulfilled in so short a time.