单项选择题

The tourist is forbidden to enter a country if he does not have a (an) ______ passport.

A．operative
B．valid
C．effective
D．efficient
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单项选择题
Issues of price, place, promotion, and product are ______ conventional concerns in planning marketing strategies.
A．these of the most
B．most of those
C．among the most
D．among the many of
单项选择题
The magician picked several persons ______ from the audience and asked them to help him with the performance.
A．by accident
B．at random
C．on occasion
D．on average
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