单项选择题

We write to each other ______ , even when there's not much to say.

A．now and then
B．by and by
C．step by step
D．more or less
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单项选择题
I don't know the restaurant, but it's ______ to be quite a good one.
A．said
B．told
C．spoken
D．talked
单项选择题
It is well known that Thomas Edison ______ the electric lamp.
A．invented
B．discovered
C．found
D．developed
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