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
Good books help us ___________ a whole new world to me .
A. turn up B. look up C. get up D.open up
There is no air _______ water on the moon .
A.and B. but C. or D.with
They don’t know what ___________ the problem .
A. to do B. do C. to do with D. do with
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
We __________ obey the traffic rules.
A. must B. have to C. may D. can
