单项选择题

The lecture which lasted about three hours was so ______ that the audience couldn't help yawning.

A．tedious
B．bored
C．clumsy
D．tired
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The group of technicians are engaged in a study which ______. all aspects of urban planning.
A．inserts
B．grips
C．performs
D．embraces
单项选择题
She keeps a supply of candles in the house in case of power______.
A．failure
B．lack
C．absence
D．drop
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