It would be too obvious for me to write the entire letter for you, but I'll include a list of points that you could include in your own writing style:
* Thanking Lee for his letter, and saying that you are happy that he is having a good time.
* Telling him roughly what you're studying at school (without being boring).
* Write about what you would like to do when you leave school.
* Finally, say that you miss him a lot and look forward to hearing from him soon.
Success is the abstract word. It is not an object.
<span>Scientists use the SI system so they can compare information all over the world. They don't need to convert any units because people all over the world use it. Also, it's more accurate than the English system.</span>
