Dear Alice,
Thanks for your letter. It was great to hear from you. Sorry, I haven't answered before, because I was busy with my schoolwork. In your letter you ask me about ecological problems in my country.
Well, I think that there are a lot of ecological problems in this country, but as for me, air and water pollution are the most serious ones. There are a lot of youth organizations protecting nature, so, I think that teenagers can join these groups and start making their own cities cleaner. I prefer living in a big city, even if it's "dirty", because in a big city I have more oppotunities to make my future career.
It's all for now. Write to me back as soon as possible.
Best wishes,
Roman
2.usually I don't get up at 7 o'clock
3.on Sunday I don't visit my friends
4.they didn't take all necessary books from the library
5.she hadn't four exams last semester