Я так понимаю, тут формат письма 11 класса, верно? :0
Dear [username],
Thank you for your last letter! I was very happy to get it!
In your letter you asked me about environment.
Fortunately, there are no ecological problems in my region because people who live here try to look after the nature. Also, administration in my school organizes some Saturday voluntary work every year where students clean school's territory. To my mind, recycling is very good idea of using rubbish because it helps to economize resources.
Also, I've prepared some questions to you about shopping center. What do like to buy here? How far is it situated from your house? Do you like the place where it's situated?
Sorry, i have to go. I hope to hear from you soon.
Best wishes,
[username[2]]