根据对话内容，回答下列问题。

A: Who's that boy under the big tree?

B: Which boy? There are four boys over there.

A: The one in a brown jacket.

B: Oh, that's my friend Peter.

A: Where's he from?

B: He's from the USA.

A: Oh! Let's go and say "Hello" to him.

B: All right. Let's go.

1. How many children are there in the dialogue?

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2. Where is Peter? 

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3. What color is Peter's jacket?

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4. Is Peter American?

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5. How old is Peter? 

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