单项选择题

You can do it if you want to, but in my opinion it's not worth the________it involves.

A．effort
B．strength
C．attempt
D．force
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单项选择题
When there was a short________in the conversation, I asked if anyone would like anything to drink.
A．blank
B．space
C．pause
D．wait
单项选择题
He must give us more time,________we shall not be able to make a good job of it.
A．consequently
B．otherwise
C．therefore
D．doubtlessly
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