Вот заполненные пропуски предлогами:
There is a living-room and a bed-room in my sister's flat. Her living-room is light and comfortable with two windows in it. There is a lot of furniture in her living-room. There is a sofa, a piano, two easy chairs and four chairs in it. There is also a book-case to the right of the door and a TV set in the left-hand corner of the room.
My sister likes sitting on the sofa in the evening and reading a book.