How are you doing?是"你好吗?"或者"最近好吗?"的意思.
等于:how are you?
一般回答: I'm fine = I'm doing great 我很好..
如果试用了东西不想买可以说:
Thanks for your service !but I am sorry that I think it is a little expensive!
谢谢您的服务,但是很抱歉,我觉得它有点昂贵.
或者款式和颜色不喜欢的话可以说：
but the style （color） is not so perfect !