单项选择题

When the engine finally started she gave a(n) ______ sigh of relief.

A．adaptable
B．sensible
C．audible
D．applicable
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单项选择题
Our new director is much younger than his ______, who is already 50 years old.
A．successor
B．precedent
C．predecessor
D．offspring
单项选择题
He works as a ______ for this community, delivering letters and newspapers everyday.
A．messenger
B．passerby
C．preacher
D．burglar
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