答案：One possible version ： Dear Dennis, I’m glad to get your letter, but I am worried about you and I am going to give you some advice to help you out. I know it’s difficult to lead a happy life without friends. But don’t worry about it too much. I think if you try to be nice to everyone, you will make new friends. Why don’t you talk to them about hobbies such as sports? As for your lessons, please believe yourself. Just as the saying goes, “nothing is impossible”. Work hard to catch up with others. It’s a good idea to ask your teachers and classmates for help. I am sure you can do better in your new school. Cheer up and come on! Best wishes. Yours, Joe
