单项选择题

These young people have much to be dissatisfied with, and they sometimes do______, but on the whole they study hard, knowing the problems the states is facing.

A．grumble
B．frustrate
C．frown
D．perplex
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单项选择题
It is true that there are still abundant reserves of metals which have not yet been______, but it is necessary to take steps to ensure that alternative materials are substituted whenever possible.
A．utilized
B．mobilized
C．acquired
D．cultivated
单项选择题
Prior to our conference, the executive director had requested that everyone______ well prepared.
A．is
B．be
C．was
D．will be
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