单项选择题

During the summer holiday season it is difficult to find a(n) ______ room in the hotels here.

A．empty
B．vacant
C．free
D．deserted
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单项选择题
The teacher ______ expects that his students to pass the university entrance examination.
A．confidentially
B．proudly
C．assuredly
D．confidently
单项选择题
Agriculture is the country's chief source of wealth, wheat ______ by far the biggest cereal crop.
A．is
B．been
C．be
D．being
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