dear Wang Li：
Firstly I proudly congratulate you on your achieving the degree.Looking back on your hard work and efforts in these years,I'm so glad that they all pay off.During these years,you wake up early everyday and read books and try your best to solve every problem you come upon.I remember that you drove for half an hour to a friend's in order to work out a question.I am so exciting that all your hard work pay off.Congratulations again for your success!