单项选择题

Albert Einstein, the greatest scientist in the 20th century, once______an offer of $1,000 a minute to speak on the radio.

A．turned down
B．turned up
C．turned out
D．turned in
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When you drive home, you can't be______ careful.
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Putting money in basic science would ______ considerable benefits for the country's health, wealth and security.
A．lead to
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