单项选择题

Sam assured his boss that he would______ all his energies in doing this new job.

A．call forth
B．call at
C．call on
D．call off
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单项选择题
They are to meet the landlord on Friday to sign the______ for their new apartment.
A．appointment
B．lease
C．penalty
D．pledge
单项选择题
With nearly no single light, the outline of the figure was barely______ in the darkness.
A．suspicious
B．perceptive
C．superficial
D．perceptible
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