补全对话。 Sam: Who's that, Mum? Mum: ______(1) Sam: Oh, it's Lin Tao. Hello, Lin Tao. Lin Tao: Hello, Sam. ______(2) Sam: Fine, thank you. And you? Lin Tao: I'm fine, too, thanks. Sam: ______(3) This way, please. Lin Tao: OK. Thanks. Sam: Mum, ______(4) Lin Tao, this is my mother. Lin Tao: Good morning, Mrs. White. Mum: Good morning, Lin Tao.______(5) Please sit down. Lin Tao: Thank you. A. Nice to meet you. B. How does you do? C. this is Lin Tao. D. Go and see by yourself, Sam. E. How are you? F. Please come in. G. You're welcome.