Why are you in such a good mood？你怎么心情这么好？
I hope we'll meet again some time.希望不久后能再见到你。
How are you doing？ 你好吗？
What's up？ 有什么新鲜事儿？
pleased to see/meet you again.很高兴再次见到你。
How's everything？ 一切都好？
Nice to meet you. 很高兴见到你。
How do you feel today？你今天觉得怎样？
How come you look so tired？你怎么看起来这么疲倦？
How's life treating you？ 日子过得还算惬意吗？