It is a fact _____ most deaths from lung cancer are caused by smoking.

Many teenagers feel no difficulty （ ） computer.

—Did you enjoy the party? —Yes. We （ ） well by our hosts.

It is essential that all these figures （ ） twice.

In this workshop, the output of July was three times （ ） of January.

I suppose you couldn’t let me borrow your car this evening, （ ）?

His fellow workers saw him fall down and blood came out from the open（ ） .

We decided to move to a quiet place, for we couldn’t （ ） the noisy environment here any more.

—Do you like pop music or country music? —（ ）. I only like sports.

Able-bodied people just don’t realize how difficult it is _____ a job.

Have you any_____that you were not there at 9 o’clock last night?

—He looks so young! —I agree with you. He looks 30, but he is （ ） 45.