单项选择题

It has been estimated that the earth"s surface temperature has increased ______ one quarter to three fourths of a degree since 1850.

A．by
B．at
C．to
D．with
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单项选择题
Most people have come to realize that it is about time the government ______ further measures to control the population.
A．must take
B．is taking
C．takes
D．took
单项选择题
Your first contact with an employer will be either to apply for a known job opening or to find out if any jobs are ______.
A．opened
B．hired
C．available
D．variable
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