阅读并回答问题。
Mrs. Green is going to give a birthday party to Mary. Mary is her daughter. She will be ten years old. A lot of her friends are coming to the party. Twenty of them are girls.
Mrs Green is getting ready for the party. Mrs. White is helping her. "That's a big nice cake," says Mrs. White to Mrs Green. "Thank you very much."
Mrs Green is going shopping now. She is going to buy fruit for the party. Mrs Green buys a lot of pears, apples, oranges and bananas. Then she goes home.
It's five o'clock in the afternoon. Everything is ready. Now the first girl is arriving. The party is going to begin in thirty minutes.