1. How are you doing?

你好吗？

2. Not bad.

还不错。

3. What's up?

怎么啦？/有什么新鲜事发生吗？

4. It's nice to meet you.

见到你很高兴。

5. It's nice to see you again.

很高兴又见到你。

6. I'm surprised¹ to see you here.

想不到在这里见到你。

7. Long time no see.

好久不见了。

8. How have you been?

你近来过得怎么样？

9. Hi, there.

嗨，你好。

10. How are things with you?

你最近还好吗？