Писать подобные открытки другу, используя проблемы ниже
I.ve been in ---------- for -------- I tgought it would be ------, it is --------,-------, and ------ I enjoy the ------- of the place You can,t imagine how -------- it is

 read a thread about that issue, but I didn't find out the right answer.What is the exact difference between:1) I've been to London.2) I've been in London.3) Have you been to London?4) Have you been in London?Thank you