单项选择题

We find that some birds ______ twice a year between hot and cold countries.

A．migrate
B．emigrate
C．transfer
D．commute
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单项选择题
She had recently left a job and had helped herself to copies of the company's client data, which she intended to ______ in starting her own business.
A．dwell on
B．base on
C．draw upon
D．come upon
单项选择题
The professor found himself constantly ______ the question: How could anyone do these things
A．poring
B．pondering
C．presiding
D．presuming
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