I did the telephone interview with a lady for UNC MACC program one month ago. i do not think she cares much about oral English.I was nervours at that time so only remember some questions, hope this can be helpful to you:
What's your plan after graduation?
What's the most difficult decision you have made?
What's your option if not been admitted by UNC?
Sorry, I only remember this three questions, and she introduced several things like the decision time...