选择恰当的句子补全对话。
Sandy: Hi, Mr Li. Nice to see you again.
MrLi:1
Sandy: Mr Li, this is my friend, Jack.
Mr Li: Hi, Jack. Nice to meet you. 2
Jack: I'm from the USA.
Mr Li: Great. How old are you?
Jack: 3
Sandy:4He's very nice.
Jack: I like Chinese. Can you teach me Chinese, Mr Li?
Mr Li: Sure.
Jack: Thank you.
MrLi:5