单项选择题

In some countries, students are expected to be quiet and ____________ in the classroom.

A．faithful
B．obedient
C．subjective
D．skeptical
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单项选择题
The bicycle is a form of transport whose ____________ we take for granted.
A．expenditure
B．satisfaction
C．coordination
D．convenience
单项选择题
I must find someone to act as a (an) ____________ for me during my absence.
A．agent
B．delegate
C．representative
D．deputy
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