He ________ to school by bike, but now he ________ to school on foot．

A．used to going; gets used to go

B．used to go; gets used to go

C．used to go; gets used to going

________ mum asked me to close the windows before going to bed, ________ I forgot to do so．

A．Though; but

B．Though;/

C．Until; them

He prefers playing basketball, ________ she prefers playing computer games．

A．while

B．so

C．and

There are several chemical factories ________ waste water into the river．

A．pour

B．pouring

C．pours

Last year, the population of that city ________ 7, 120, 000．

A．was

B．were

C．has

In our class, about ________ of the students are girls．

A．three fifth

B．third fifths

C．three fifths

One-child policy has ________ controlling China's population．

A．did well in

B．worked good in

C．worked well in

Mrs White isn't here．She ________ London．

A．has been to

B．has gone to

C．has gone

中央电视台的英语缩略形式是________．

A．CCTV

B．VOA

C．USA

I'm waiting for my friend．If she ________, I'll go shopping alone．

A．doesn't come

B．comes

C．won't come