用方框中适当的句子完成对话. Liu Hua:Good morning,Mum! 1 ,Miss Gao. Mrs.Liu:How do you do,Miss Gao? Miss Gao: _2 __ Mrs.Liu:Welcome to our home. Miss Gao:Thank you. Mrs Liu: 3 Please sit down. Miss Gao: __4___
A.How do you do? B.This is my teacher C.Thanks. D.You're welcome.