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

（ ） weather may be too hot to the tourists.

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

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

Since Dick was busy, he rarely had time to go to the cinema; _____.

The defense computers calculate way to （ ） the enemy missiles.

Neither his family nor he （ ） anything about it.

If I had remembered （ ） the window, the thief would not have got in.

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

I used to smoke _____ but I gave it up 3 years ago.

Most people make such mistakes （ ） in their whole life.

Without your instruction, I （ ） such great progress.