Thank u so much mr.Bruce for ur kind responce.TODAY i just get to know about the way you mention and tomorow i have to go there and try to atleast extend MORE 15 days because my first visa was issued only for 15 days,i hope they will extend atleast more 15 days.But May be you can suggest me in which way i can extend my visa after 15 days without going out from china.My wife is going to apply for the 工作证，can you make me clear if she will have it,it means that i also will have it automatically as her husband? B.coz to making such document it will take some time and i don't want to waste money and time and go out from China for the period my wife will prepare the official working permit. Pls advise me the best way....looking forward to your reply!
... thanks for ur kind reply!