We have prepared some umbrellas at the __________ office in the metro.
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If you are in _______, you can take one away.
A. want
B. need
Really,I _______ it.
A. thank
B. appreciate
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