Finally....I've come to the end.
Today morning, I received an email from Michigan notifying that I am in the waiting list. However, this afternoon, the FedEx package I had talked about before has arrived and it was an acceptance letter from MIT NSE. Wierd thing is that I applied to their MS program but I got a PhD admission with sufficient fundings. Super excited!
I am going to send emails to other universities to tell them stop reviewing my application. I appreciate all of you in this thread for giving advises and hope you all to get admissions from universities you want.