根据对话回答问题。

Sarah: My bag is heavy.

Mike: What's in it?

Sarah: Look! Twenty-four story-books, thirty-five pencils, forty-eight rulers, fifty erasers, twelve pencil-cases.

Mike: Wow! My dear!

Sarah: What's in your bag?

Mike: Look! Four story-books, two pencils, one ruler, one eraser and one pencil-case.

Sarah: Oh, your bag is very light.

1. Is Mike's bag heavy?

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2. How many pencils does Sarah have?

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3. How many rulers does Sarah have?

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4. How many story-books does Mike have?

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5. What's in Mike's bag?

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