单项选择题

（） you have written authorization from the Security Department, please do not enter the zone delineated by the green line.

A.Because
B.Unless
C.Despite
D.Whereas

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All employees are （） to perform their duties in a professional manner at all times.

A.apparent
B.alleged
C.allowed
D.supposed
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The management encourages all staff to place any complaints, suggestions, or questions in the box （） in the lunch room.

A.provided
B.provision
C.providing
D.provide
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