Too many hotels have been built and this has _____ prices, making holidays cheaper.

Mr. Smith gradually _____ a knowledge of the subject.

The car was completely _____ and the driver seriously injured.

The firemen managed to _____ the fire in time.

. Don't _____ the news to the public until we give you the go-ahead (许可，准许).

When the big bills for mother's hospital care came, father was glad he had money in the bank to _____.

The policeman signed to a driver to ______ to check if he had drunk.

—Dad, I have been appointed as manager of our company, but I’m worried about it.
—Why worry? Increased responsibility can ______ your best qualities.

-I heard Back Street would sing at the New Theater.?
-Where did you _____?

The family is a cooperative enterprise for which it is difficult to _____ rules, because each family needs to work out its own ways to deal with its own problems.