单项选择题

A pilot should be responsible（）the safety of all the passengers on board.

A.against
B.at
C.for
D.with

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A pair of spectacles（）what I need at the moment.

A.is
B.are
C.has
D.have
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A number of people（）at the street corner.

A.am
B.is
C.are
D.be
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