The key answer of exercise 2

a)

1. there's
2. Is there
3. there isn't
4. there's
5. are there
6. There are
7. a
8. there is
9. any
10. any
11. some

b)

1. There are some armchairs
2. Are there any carpets
3. There aren't any plants
4. There are some books
5. Are there any glasses
6. There aren't any files

c)

1. It
2. it
3. There
4. they
5. There
6. There
7. there
8. there
9. there
10. They

d)

1. There's a bike on the wall.
2. There's a sofa under the bike.
3. There are some boxes on the shelves.
4. There's a small table in front of the sofa.
5. There's a small carpet on the floor.
6. There's a window in the corner.