单项选择题

You've been talking with David all evening when you ought to be ______ with other guests.

A．blending
B．integrating
C．mingling
D．incorporating

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单项选择题

I arrive at nine o'clock, teach until twelve thirty and then have a meal; that is my morning ______.

A．habit
B．custom
C．practice
D．routine

单项选择题

Economic theory would predict that a fall in the price of a commodity would lead to an increase in ______.

A．assumption
B．resumption
C．consumption
D．presumption

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