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
Old Americans are extremely reluctant to buy on______ and likely to save as much money as possible.
A．revenue
B．credit
C．deposit
D．claim
单项选择题
If a person talks about his weak points, his listener is expected to say something in the way of______.
A．assurance
B．persuasion
C．encouragement
D．confirmation
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