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
What a ________ rain ! It has rained ______ since last night.
A. heavily heavy B. heavy heavily
C. hardly hard D. hard hardly
—Andy finished first in the competition!
--- Really ? Sounds ________ to believe.
A. too good B. good enough
C. quite good D. so good
