Dear susan,

 Sorry I havent written for so long but i have been really busy resently studying for my exams. It was great to get your letter and hear all your news, especially the part about your coming to visit me in September.

I am really glat to see you and i want to show my school. Yesterday my classmates and i went to the cinema. And tomorrow we will have a disco.

 I hope your exams go well. I am looking forward to see you in September and I want to acquaint you with my classmates!