单项选择题

It is imperative that students ______ their term papers on time.

A．hand in
B．would hand in
C．have to hand in
D．handed in
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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
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
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