单项选择题

Quizzes are given every other week to make sure that the students ______ keeping in pace with what is going on in the class.

A．are to be
B．will be
C．shall be
D．are
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单项选择题
The Zhangs have moved into a new house and their old apartment was ______ a good price.
A．sold up
B．sold at
C．sold off
D．sold out
单项选择题
Most people thought that these competitors didn't ______ their prizes because they cheated in the competition.
A．conserve
B．preserve
C．deserve
D．observe
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