Candada PR reentry

Friends with experience in Canada immigration please help!

I obtained Canadian PR two years ago but just stayed there for one week and then went back to U.S. to continue my study. I applied returning permit once and expiration date is January 2003. Now I would like to go back to Canada for visit and then stay there if possible. Do I still have chance to be admitted into Canada? What kind of questions they will ask at the customs or bordering post?