Explanation:
If you are writing a letter to your friend, first, you must write the information about your full address, your friends' address, and the date.
Dear Alex, I am writing to you because I miss you very much. I know that you have heard some bad things about my behavior but that is not true.
Everyone is talking about the divorce of my parents but that is not true. They will figure it all out. I am not as sad as everyone has told you. I have many friends in my town too. It is true that I am not seeing them, but they are my friends, trust me. I heard that my mother told you that I gained some weight but that is not true either, I am going to the gym every day. Everything is going fine.
Maybe you have heard that I am seeing your ex-girlfriend, but no, I am not. We went just to drink a coffee couple of times. How is your life going? Tell me everything.
Your dear friend, Ivan.
To make awareness that pollution is getting worse and needs to stop.
The last one...
there are not enough bicycles for the residents of the kilbarchan home for boys.
Charity - the voluntary of giving help, typically in the form of money, to those in need; an organization set up to provide help and raise money for those in need.