A. must have been
B. must be
C. must be being
D. must being
A. go
B. am going
C. goes
D. went
A. in
B. out of
C. into
D. from
A. stop
B. stops
C. would stop
D. stoped
A. drank
B. drinking
C. drunk
D. drink
A. free
B. friendly
C. clever
D. boring
A. will
B. should
C. must
D. can
A. because
B. because of
C. although
D. despite
A. buying
B. selling
C. cooking
D. making
A. reserved
B. clever
C. active
D. smart
A. can
B. could
C. will
D. should
A. will meet-will finish
B. will meet-has finished
C. will have met-has finished
D. will have met-will finish
A. too long for us to see
B. very long for us to see it
C. too long for us seeing it
D. too long enough for us to see
A. mustn't
B. won't
C. needn't
D. don't need
A. be
B. is
C. are
D. were
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