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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