I'm living in China. ×
I live in China. √
"I'm living in China"表达“我暂时住在中国”,并非长期生活定居,给人的感觉好像你是来旅游的,过段时间就要走
Don't care about things ×
Stay out of it! √
"stay out of ..." 表示“置身于...之外”,所以在叫别人不要管闲事的时候,可以吼出来Stay out of it! (通常不礼貌)
It's none of your business, stay out of it!
这没你什么事,少管闲事。