IX. Change the given groups of words as in the model
Model: the room of my sister - my sister's room
the friends of my sisters - my sisters' friends.
1. the brother of my mother; 2. the friend of my sister; 3. the husband of his daughter; 4. the house of my parents; 5. the table of my father; 6. the work of my mother; 7. the notebook of this student; 8. the books of these students; 9. the sister of my friend; 10. the friend of our cousin; 11. the photo of my grandfather; 12. the room of Pete; 13. the son of her brother; 14. the daughter of Ann; 15. the sister of my mother.