One day the famous American scientist Albert Einstein met an old friend of his on a street in New York.

　　“Mr Einstein,” said the friend, “ it seems that you need to put on a new overcoat. Look, how worn-out it is!”

　　“It doesn’t matter,” answered Albert Einstein. “No one knows me here in New York.”

　　Several years later they met in New York again. Einstein had been a world-famous physicist after then but he still wore the same old overcoat.

　　Once more his friend persuaded him to buy a new one.

　　“There is no need now,” said Einstein, “Everybody here has known me.”

　　根据短文内容，回答问题。

　　1. Where did Albert Einstein met an old friend of his?

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　　2. What did the friend want him to buy?

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　　3. How about Einstein’s overcoat?

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　　4. Did Einstein still wear the same old overcoat when he became a world-famous physicist?

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　　5. What did Einstein say when the friend persuade once more him to buy a new overcoat?

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