People's ________ for bicycles may reflect public dissatisfaction with bus service.

A. insistence B. preference

C. confidence D. reference

The Australian boy has a good ________of Chinese and can communicate with others freely.

A. request B. command

C. demand D. usage

—I wonder ________ Mary has kept her figure after all these years.

—By working out every day.

A. where B. how

C. why D. if

I________through that bitter period without your generous help.

A. couldn't have gone B. didn't go

C. wouldn't go D. hadn't gone

Whether the buildings in this area should be pulled down has remained ____；people are still looking for other possible solutions.

A. unchallenged B. relevant

C. controversial D. contradictory

How could you ________ such a fantastic job when you have been out of work for months?

A. turn off B. turn in

C. turn down D. turn to

The government has been under growing pressure to ________ the causes of air pollution as smog frequently smothers the country's large cities.

A. release B. schedule

C. address D. maintain

Compared with the generation of our grandparents, who grew up in an age when people were lack of almost every kind of materials, we should be content with the________ supply.

A. abundant B. apparent

C. absurd D. academic

—I wonder why he has been acting so strangely these days.

— Recent pressure at work may ________ his behavior.

A. account for B. make for

C. stand for D. change for

He would rather ________lectures to the students than ________to different boring conferences.

A. to give；be invited B. give；be invited

C. giving；be invited D. giving；being invited