文本：
Twenty one: What's this?
Twenty two: It's a cake.
Twenty three: What's that?
Twenty four: It's an orange.
Twenty five: Are you hungry?
Twenty six: Oh! nice.
Twenty seven: May I have some?
Twenty eight: Excuse me!
Twenty nine: Is that your apple?
Thirty: May I have it?
a: What's this Edda?
It's a cake.
What's that?
It's an orange.
b: Edda! are you hungry?
Yes, what's this?
It's a cake.
Oh! nice.
c: Mom, What's this?
It's a melon.
May I have some?
Of course.
d: Excuse me,
Is that your apple?
May I have it?
Please!
Thank you.
