1. Liz / the text-book A Liz's text-book B the text-book of Liz C the Liz's text-book 2. the roof / the house A the house's roof B the roof of the house 3. the rabbits / the cage…

Here are the correct answers for each item:

1. Liz / the text-book
   Answer: A Liz's text-book

2. the roof / the house
   Answer: B the roof of the house

3. the rabbits / the cage
   Answer: B the rabbits' cage (also acceptable: C the cage of the rabbits)

4. our dog / a new kennel
   Answer: A our dog's new kennel

5. The Smiths / the car
   Answer: A the Smiths' car (also acceptable: C the car of the Smiths)

6. Charles / the book
   Answer: C Charles's book

7. a bird / a nest
   Answer: B a bird's nest

If you have any more questions or need further assistance, feel free to ask!