单项选择题

They have cooperated so well that they decide to ______ their agreement for another five years.

A．renew
B．recall
C．recover
D．refine
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单项选择题
When he explained it again and again, the students' patience ______.
A．ran over
B．ran on
C．ran out
D．ran off
单项选择题
We were all struck ______ at the bad news he told us.
A．dumb
B．deadly
C．badly
D．blind
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