单项选择题

This is the microscope ______ which we have had so much trouble.

A．at
B．from
C．of
D．with
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单项选择题
Three new buildings ______ on the campus by the end of this year.
A．will be built
B．are going to be built
C．will have been built
D．have been built
单项选择题
______, water should be regarded with caution as it can be dangerous.
A．Beautiful as it is
B．It is beautiful
C．As it is beautiful
D．Beautiful it is
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