单项选择题

Another sleepless night finally put an end to the demanding work, so he felt relieved and ______ himself with satisfaction.

A．expanded
B．stretched
C．prolonged
D．extended
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单项选择题
Medical experts have ______ the increasing demand of organs years ago and they have been devoted to getting the substitutes from other species.
A．foreseen
B．fabricated
C．inferred
D．boycotted
单项选择题
The number of people buying their own houses has sharply ______ as a result of the economic recession.
A．declined
B．lessened
C．descended
D．slipped
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