We __________ obey the traffic rules.

A. must B. have to C. may D. can

Don’t try to do everything at once. Take it a bit _______________.

A. at times B. at a time

C. at all times D. at that time

They don’t know what ___________ the problem .

A. to do B. do C. to do with D. do with

There is no air _______ water on the moon .

A.and B. but C. or D.with

Good books help us ___________ a whole new world to me .

A. turn up B. look up C. get up D.open up

The task is so hard for

e . I don’t know _______________.

A. what I can do B. how to do C. what to do D. both A and C

--- Lily is ill in hospital .---Really ? I _____ know she was ill .

A.don’t know B.know C. knew D.didn’t know

Mr Wang isn’t here , I think he __________ Shanghai .

A. went B. went to

C. has gone to D. has been to

Would you mind ___________ me how to start this online tour ?

A.show B. to show C. showed D. showing

What do you usually use your computer _________ ?

A.in B. with C. for D. to