Dear Bianka, (musi byc przecinek, no chyba, ze piszesz maila)
Thank you very much for your letter. I am sorry that it has taken me so long to write to you. I have been very busy at school for the last 3 weeks.
I'M so happy that you`re coming to London ON this holiday. I can`t wait to see you. You are PLANNING to spend here two WEEKS, but perhaps you will stay longer WITH us. What do you say? I think that it would be hard for you to get to my house by yourself, so we will meet at the aiport.
I hope you will ENJOY yourself in London. Here, THERE are such a lot OF things to see and places to visit, so it`s not possible to get bored.
You`re planning to go to museums and art galleries. I think the most IMPRESSIVE and worth [] seeing is THE “Museum of Modern Art". I'M sending you some photos of London and places WHICH I'VE recommended. Maybe we`ll visit THESE places together.
PLEASE give our best wishes to your parents and family. Hope to HEAR from you soon.
Basia