These flowers must_____once a day.()
A. watering
B. be watered
C. water
D. to water
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Be careful! There are some_____glass on the ground. ()
A. broke
B. breaking
C. broken
D. break
It is a great waste to leave the______water all day long.()
A. running
B. to run
C. run
D. ran
They are cleaning up the______leaves on the road.()
A. fall
B. falling
C. fall
D. fallen
Keep liquid(液体) away________your camera. ()
A. on
B. to
C. from
D. \