补全对话（5%）
Helen: Hi! I’m Helen. _____________________________?
Peter: My name is Peter. I'm from America. ____________________________?
Helen: Oh, I'm from England. How old are you, Peter?
Peter: I'm thirteen.  _________________________?
Helen: I'm twelve. ________________________?
Peter: I' m in Grade 7.
Helen: Great. We are in the same grade. ___________________________?
Peter: My favourite sport is swimming.
Helen: I like swimming, too.