Dear Sir and Madam Smith!
I am writing to thank you for my stay in your home. I came back to Poland yesterday at 7p.m. The journey was quiet, with me there was a lot of people in the aeroplane.
Thank you very much for help. I was trying to get to the bus, when somebody steal my bag. You called for the police, and explained the policeman what happened, because I was too nervous to do it myself.
The most exciting event was trip to the zoo. I have never seen such different animals. I took many photos, and now I can show them to my friends from school.
As I told you, I hope you'll visit me soon. I will try to organise your stay in Poland as interesting as my in England.
I look forward to receiving your reply.