It is difficult to keep in touch with a couple of friends in ditance.When it comes to me,it does so.There have been several years since I left the old street area and friends in the neighborhood .I was always going to write to them,but it was stopped by some things and I have no time.Now I have lost contract with them.I often keep them in my mind.I believe I will try my best to keep up correspondence with kinds of them in the future.