Suppose you have an American friend Mark on the internet.He wants to know more about you.Please write to tell him your hobbies and ask about his.
You can write according to the questions below:
1) What do you like collecting?
2) How long have you been collecting?
3) How many do you have?
4) Which do you like best? Why?

Example:

Dear Mike ,

    I want to tell you about my hobby. I collect kites . I’ve been collecting them for four years, and I have 123 of them now. I collect them because they are beautiful and interesting. I have a kite with the face of Monkey King, which is a present from China. And I have some kites like butterflies. They are just like real animals in the sky. Every sunny Saturday I’ll go and fly one of them. They bring me so much fun. If you know anyone else who collects them, please tell me. I’d like to make friends with them.

Bye the way,what's you hobby?

Yours

Bob