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augusBF, thank you very much for your reply, you offered me a lot of useful information.
My place has a 13hrs time difference with chapel hill, so I never got a good time to call janet jones. But I send email to her and she promised to hold this dmission until 4.30, I will have more time to make decision. And I also know someone declined their offers from UNC, so I am expecting some luck.
Have you accepted this offer?