Dear Christina
Thank you for your letter!
Sorry that I didn't answered so long. Good luck on exams and I wish you the highest mark. I won't be surprised if you will study in the best college of Moscow. Because you are very clever. I will try to visit you this June at the weekend. We will have a lot of fun together. If you will have time then answer my letter please.
With love, Mary.
Кое-что я изменил, что гучне перевести