It’s not good for people __________ waste water (污水) into the river.
#62287
A
to put
B
putting
C
to pour
D
pouring
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You must look_______ yourself and keep_______ 
#53505
A
for,health
B
up,health
C
after,healthy
D
like,healthy
I hope you __________ English well. 
#53922
A
learn
B
learns
C
learning
D
to learn