Dear Mary,

How time flies! we have been friends for two years. I am writing to thank you for your great help. Two years ago ,I had few friends in the new school.How lonely I felt!I was so sad.But my life has changed so much ever since we became pen pals.We used to write to each other.And you always encouraged me to make more friends and taught me how to learn English well.Of course we always shared happiness in the letters. Great changes has taken place in Shanxi.Roads are becoming wider and buildings becoming wider and buildings are becoming taller. So I hope you can come and visit our city and have a good time. Hope to see you soon.

Yours, Linda