1. I haven't seen you for a long time. / Long time no see.

好久没见。

2. How have you been?

最近过得怎么样?

3. How's everything going?

最近过得还好吗?

4. What's happening?

在忙什么?

5. What have you been up to?

最近都忙些什么?

6. It's really nice to see you again.

再见到你真高兴!

7. What keeps you so busy lately?

你最近怎么这样忙?

8. What's up?

近来可好?

9. What's going on?

一切都好吗?

10. It's been a long time. How are things treating you?

好久不见。你怎么样?