What should I do, doctor? ________ healthy , you should take more exercise.
#48682
A
Keep
B
Keeping
C
To keep
D
Kept
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—How dangerous!— Yes. I think the policeman should stop the children soccer in the street.
#49790
A
play
B
playing
C
to play
D
plays
Although we’ve learned English for years, we have trouble _____ the foreigners.
#50181
A
understand
B
to understand
C
understanding
D
of understanding