单项选择题

Chief Engineer Mike Myers' expertise （） chemical materials has enabled him to move to the very top of his field.

A.against
B.for
C.on
D.in

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单项选择题
In recent months much academic debate has arisen （） the government's intention to privatize the public transportation and ambulance services.

A.by
B.to
C.with
D.over
单项选择题
Government regulations state that no one can be （） to the closed reading room without first obtaining a security clearance.

A.suited
B.required
C.admitted
D.disposed
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