A. was
B. is
C. has been
D. had been
A. conserving
B. conservation
C. to conserve
D. conserve
A. will destroy
B. will destroyed
C. will been destroyed
D. will be destroyed
A. watch
B. watching
C. watches
D. to watch
A. used be drunk
B. used to drunk
C. used to be drunk
D. used to be drank
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