单项选择题

He drives much ______ than he did ten years ago.

A．carefully
B．more careful
C．more carefully
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单项选择题
What can visitors do at the Maryland Science Center
A．Learn science by trying it out.
B．Watch and take pan in a play.
C．Make gifts for their friends.
填空题
Father gave $20 for me to buy some books. I ______ $ 20 by father to buy some books.
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