______ careless, or you will make mistakes.
A. Be not
B. Not be
C. Don’t
Don’t be
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The No.8 bus ______ to Chengdu college of Geology, and not to Sichuan University.
A. are gone
B. is being gone
C. goes
D. are going
If it ______,the match will be postponed.
A. has been rained
B. does rain
C. rains
D. is rained
As soon as I ______ the tools, I shall begin with the work.
A. have
B. am having
C. have been having
D. have been had
Once you ______ the knack of it, you will have no further difficulty.
A. shall have
B. had had
C. are having
D. have