【答案解析】Dear Wang Yu,
When I heard that you fall ill and stay in hospital, I am very worried. How are you feeling now? Are you getting any better?
The weather has been changing a lot lately, which often causes illness, and you must also be suffering from great school-related stress. It"s very easy to get sick under the circumstances. At the moment, you should temporarily leave your study aside and turn your attention to your health. When you are well, you should take more care of yourself, doing some exercise, to prevent diseases. Immediately you"re out of the hospital, I will try my best to help you with your studies.
Once I have time, I will go to see you. Get well soon!