English composition about influenza

Dear teacher:

I really want to say thank you, because you not only taught us a lot of knowledge, but also cared about us. I still remember last spring, when influenza A spread rapidly in the city, you were worried about our health. You, my dear teacher, ask us to wash our hands and bathe often. You also suggested that we open the window and not go to crowded places. You suggest that we drink more water and form good habits. You go out early and go home late to spray medicine. Very hard. My dear teacher, thank you again.

Best wishes!

yours respectfully/sincerely

Mike