把对话补充完整。
A：Hello! I'm John. What's your name?
B:
A: Where are you from?
B:
A: How old are you?
B.
A: Look! .Today is my birthday. Have some cake, please!
B:  Thank you!
A: . Let's eat the cake.
B: OK!

A. I'm from the USA.    B. My name is Amy. C. You're welcome.      D.I am six years old. E. Happy birthday!        F. I have a big cake.