单项选择题

It ______ the post office time if people address letters properly.

A．earns
B．wins
C．gains
D．saves
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单项选择题
The rapid development of communications technology is transforming the ______ in which people communicate across time and space.
A．route
B．transmission
C．vision
D．manner
单项选择题
He has ______ various adventures.
A．passed for
B．passed through
C．passed away
D．passed down
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