阅读下面短文，回答问题。
David is eight. One day his friend Rose says to him, “This Sunday is my birthday. Can you come to my birthday party?” David says, “Yes.”
On Sunday, David asks his mother if he can go to the party. His mother says, “Yes, you can go, but you must be polite(有礼貌的). Don’t ask for any food. They will give you some.” “All right, Mum.” David answers. At 8 o’clock, he goes to Rose’s house on his bike. The street is not busy on Sunday, so he gets to Rose’s house at twenty past eight.
There are lots of kids at the party. They play together for some time, and then Rose’s mother gives them some food, but she forgets David. He waits and waits and then he takes his bowl up and asks, “Do you want a nice clean bowl?”
How old is David?
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Whose birthday is it?
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How does David go to Rose’s house?
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How long does it take David to get to Rose’s house?
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Why does David take his bowl up?
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