______from the space, the GreatWall looks like a dragon
A. having seen
B. seeing
C. seen
D. to see
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The crops would have been destroyed if the fire______in time
A. hadn't stopped
B. wasn't stopped
C. stops
D. didn't stop
Nothing can _____ the fact that old people and children are our responsibility.
A. apply
B. after
C. change
D. adapt
His success was because of the fact______he had been working hard.
A. that
B. which
C. what
D. it
This problem is said_____three times
A. discussing
B. to discuss
C. having been discussed
D. to have been discussed
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