The ground near the subway entrance and exit may be quite ________.
A. slippery
B. slip
Our staff has already _______ the floor.
A. sweep
B. swept
The entrance of Line 7 at Sanwayao station is closed _______ heavy rain.
A. because of
B. because
_______ your steps. The floor is so wet. please walk on the non-slip mat.
A. Watch
B. Look at
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