Well, it turned out that I didn't get any offer.
I think, from international applicant's point of view, what hurts me is my poor english. I got too low verbal/writing GRE. My TOEFL is not really good. As for Subject Test, it is not that good but not too bad. I'm wondering if I have to try Subject Test again as well. My prof. told me they just want to be sure that I'll be able to serve as a TA.
Anyway, keep our fingers crossed!!
