【正确答案】Dear Mr. Smith,
{{U}}I'm very sorry for{{/U}} delayed response to your letter concerning about my college life before graduation. I have been busy preparing my thesis defense those days.
Just as you know, with graduation approaching, our college life becomes tense and interesting. Most of us concentrate on preparing for thesis defense, which is the required threshold for any graduates. {{U}}Fortunately{{/U}}, I have defended my thesis successfully with a satisfactory score yesterday. What's more, another piece of good news is that I have found an ideal job offered by IBM, where I have worked three months as an intern. {{U}}Therefore{{/U}}, I can enjoy the last time of university life happily without any burden in thoughts.
{{U}}Thank you for your concern{{/U}}. I will visit you as early as possible after my graduation. {{U}}May you be blessed with good health forever!{{/U}}