Brain teaser

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This morning only had half a day's class, why are the students still unhappy?

When was the delight of being tricked?

In the tortoise-rabbit race, the rabbit lost, but what can the rabbit definitely win the tortoise?

Who is the most persistent painter in the world?

Do you know what's wrong with sleeping in class?

If this is done for the first time, then it is good, but if you do this twice, then it is bad, what is it?

How can I have both fish and bear's paw?

Who is the best-hearted person?

Which country has the largest population in the world?

Which word can never be written well?

A man rushed into the toilet for half a day and occupied the manger. Why?

What can a coward eat to embolden?