It is necessary ____ this in mind.
A. keep
B. keeping
C. kept
D. to keep
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____ took us half a year to finish the work.
A. This
B. That
C. It
D. They
____ is true that he won the game.
A. This
B. That
C. It
D. The
It is ____ that 5 people were killed in the earthquake.
A. report
B. reported
C. reporting
D. to report
It's impossible ____ him ____ there in time.
A. of , to get
B. for , getting
C. of , getting
D. for , to get