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We must do everything we can _________ our earth clearer and safer.
#49701
A
made
B
to making
C
make
D
to make
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Let’s__________ and have a rest.
#49972
A
stop
B
to stop
C
stopping
D
stopped
—Doctor, I am afraid I am getting fat these days. — _____ slim, you should change your diet and lifestyle. 
#49022
A
Keeping
B
Keeps
C
Keep
D
To keep
Would you mind _______ the window for me? I feel a little cold.
#50142
A
opening
B
closing
C
to close
D
to open
 What should I do, doctor? ________ healthy , you should take more exercise.
#48682
A
Keep
B
Keeping
C
To keep
D
Kept
My mother told me _______ junk food at school.
#49946
A
to not eat
B
not to eat
C
don't eat
D
didn't