Thank you for your kind words！ It's been a long time ， and during the last year，i managed to get good grade in my toefl test(107) and gre(332).. Several days ago i received the admission of northwestern university!! I'm so sorry that I've seen your reply but i didn't leave a message. I tried to be fearless when facing such obstacles and finally all the efforts i made pays off. Thank you very much for your help，your words have accompanied me during my darkest days