【正确答案】正确答案：Dear Mrs. Black, I have learned with delight that your son has been admitted to the famous Tsinghua University. I would like to extend to you my utmost congratulations on his enrollment. I feel very happy for you. And it' s really a good news to your family and friends as well as all your students. You must be very happy with this good news. I know this is surely owing to your son' s talent and diligence. It is also a reward you richly deserve for your years of tireless teaching and guidance. With his gift and assiduity, I' m sure that he'll make greater achievement in university. I hope I can express my sincere congratulation to you and your son in person. Again, please accept my sincere congratulations and best wishes for the whole family. Sincerely yours, Li Ming