Happy birthday.Although I don't know whether this letter will arrive on time,I hope you can feel my benediction.As a matter of fact,I'm not exceptional for pity because it is a common emotion of human.(这句你写的有点不通,稍稍改了下）If I didn't left Nanning,I would joined your birthday party.You are my best friend in China as we have been hung out since the day we entered the No.8 Middle School.We spent our spare talking gossips,having fun and doing many interesting things together.You cared about me,listened to me and gave me some useful advice when I was upset.These all made thankful.We have made a lot of precious and happy memories during our high school life.
I want to make a special present which is a card witten with "Happy birthday" in ten different languages for your birthday this year for my absence of your birthday party.It cannot be birthday everyday,so I hope you enjoy the present.Be happy in followed days and weeks and months and years.