—What do you mean ________ saying “The boy is overgrowing”?
— I mean that he is tall ________ his age.

—Are you firmly against any independence move by Taiwan?
—Of course. That’s ________ our basic interest lies.

________ has already been pointed out, only by correcting mistakes can you make progress.

It was three o’clock _______ he came back from work.

Scientists say it may be five or six years_______it is possible to test this medicine on human patients.

People in the west make_____a rule to buy Christmas presents for their relatives and friends.

—Oh, dear! I forgot the air tickets.
　  —You ______ something.
　 

It is no use _______ about the coming exam.
A. worry   B worrying   C  worried   D  to worry

It was very important for us  ________ happy every day.

-You look upset.
-Yes, this is the first time I________ form home.