单项选择题

Your service is entirely ______ not compulsory.

A．selective
B．optional
C．voluntary
D．reluctant
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单项选择题
Really, Edwin is afraid of Angela, but the ______is also true: Angela is afraid of Edwin, too.
A．inversion
B．insertion
C．version
D．reverse
单项选择题
You'd better hang up this oil-painting on that ______ wall.
A．empty
B．blank
C．vacant
D．bare
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