Here are the correct answers for the blanks in the passage:

1. **C** - rooms
2. **C** - are
3. **A** - has
4. **B** - on
5. **C** - brush

So the completed sentences would read as follows:

"My house has four **rooms**: a living room, a kitchen, a bedroom, and a bathroom. The living room is very cosy. There **are** a big sofa, a TV, and a small lamp. In the kitchen, we **have** a table, four chairs, and a stove to cook food. My bedroom is my favourite room. There is a bed, a desk, and a bookshelf next **on** the window. The bathroom is small, but it has a shower and a sink to **brush** my teeth."