-What should T do, doctor? -_______ healthy, you should take more exercise.
#48762
A
Keep
B
To keep
C
Keeping
D
Kept
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It’s important __________ fire.
#50876
A
to care
B
be careful
C
to be careful
D
to be careful with
Thank you for______us,Mr Li 
#49958
A
help
B
helps
C
helping
D
helped
The policeman told the children _____play in the street.
#48603
A
didn‘t
B
to not
C
not to
D
don‘t