One thing to be careful of is to not ask too many personal questions all at once. Some westerners find that Chinese nationals are very enthusiastic and friendly, which is great, but also can be intrusive which is uncomfortable. Do ask personal questions but not straight away or all at once. Personal can be about family too which I believe is a common topic of conversation in China more so than in Western countries. Personally I don't mind and in my experience I have not found any of my friends from China to be too intrusive, but others have mentioned this issue to me.

well! first you have to kow their language then everything comes with time.