Although she is young, ________ she knows several foreign languages.

A. but

B. so

C. and

D. /

Even the best student in our class couldn't answer this question, so it ________ be very difficult.

A. must

B. could

C. may

D. can

?Why did ________ take Aunt Alice an hour to get home?

?I don't know. Maybe there was something wrong with her car.

A. that

B. it

C. she

D. this

At that time I really don't know ______.

A. what to do it

B. how to do

C. what to do

D. how I do

You must ______ all the difficulties and finish the work.

A. get off

B. get up

C. get over

D. get to

?______ will your father go back to Beijing?

?In two days.

A. How often

B. How long

C. How soon

D. How far

Mr Wang told us that the earth ______ round the sun.

A. go

B. go

C. went

D. was going

If China has ______ pollution, it will become more beautiful.

A. fewer

B. less

C. more

D. little

Will you mind ______ the air conditioner I feel very hot.

A. not closing

B. closing

C. open

D. not open

Grandma ______ breakfast when I washed my face this morning.

A. was cooking

B. cooked

C. cook

D. is cooking