Why don't babies need glasses?
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What do you drop when you need it and take back when you don't?
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What's the difference between a monkey and a flea(跳蚤)?
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What is black when it is clean and white when it is dirty?
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What 5-letter word has six left when you take 2 letters away?
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What is the center of gravity?
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What never asks questions but always gets answers?
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When Columbus discovered America,where did he stand?
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What is ""four feet on four feet waiting for four feet?
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When the boy fell into the water,what's the first thing he did?"
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