补全对话。 Li Lei: Oh, it’s you, Lucy. 1._____to see you. Lucy: Nice to 2._____you, too. Mary. Li Lei: Come in, please, Mum, 3._____is Lucy, my friend. She 4._____ American. And this is my mother, Lucy. Mum: 5._____do you do, Lucy? Lucy: 6._____do you do, Aunt? Mum: Sit down, please, Lucy. Li Lei: 7._____ you like 8._____ milk? Mum: I don’t like 9._____very much. Li Lei: 10._____would you like? Lucy: I’d 11._____a pear. Li Lei: OK. 12._____you 13._____! What 14._____ something to drink? Lucy: All right. Li Lei: 15._____it is! Lucy: Thanks!