—What do you think of New York City?
—It's a good place _____.
[     ]
A. have fun
B. having fun
C. to have fun
D. for funny
Farmers shouldn't keep _____ the forests but should continue _____ more trees.
[     ]
A. cut down, plant
B. cutting down, to plant
C. to cut down, to plant
D. to cut down, planting
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