1. (2018三上·浙江期中) 给句子排序，使它们成为一段通顺的对话。

Good afternoon, WuBinbin.

Nice to meet you, Jack. Happy birthday!

Good afternoon, Mike.

(  7  )I'm 5 years old.

(  3  )This is my brother, Jack.

How old are you?

Thank you.