4. Soccer Ball
A: Why is this soccer ball pink?
B: I bought it at the breast cancer fair.
A: I thought that all soccer balls are black and white.
B: The pattern isn't what makes it a soccer ball!
A: Then what makes it a soccer ball?
B: What's important is the material it's made from.
A: What's so special about the material?
B: It allows the ball to bounce, but not too much.
A: I see. It would be hard to control a bouncy ball.
B: My ball is a little flat, though.
A: We'd better fill it up. If we don't, it won't even roll.
B: Have you seen the air pump?
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