单项选择题

You should have your eyes tested every year in case the ______ of your spectacles need changing.

A．lenses
B．glasses
C．sights
D．crystals
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单项选择题
You'd better let me know as soon as there is a(n) ______ position in the branch office.
A．empty
B．vacuum
C．hollow
D．vacant
单项选择题
______ his poor record in school, the board thinks that he should study hard.
A．In spite of
B．In charge of
C．In view of
D．In case of
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