I got a plenty of knowledge about CPA. Newcamember, you are really helpful. However, I am assuming that CPA is not suitable to me for the time being. So maybe I have to apply for the master programm(almost four years for me) in one of US universities' business school, thus I can stay with my family and get working visa after graduation. Anyway, I appreciate your explaination and kindness. Best wishes for you.:p :p :p