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