16. Mark reads the book. It is (hers, his, mine) 17. I have a bag. This is V. (ours, mine, yours), 18. Our neighbors have new pets. Those are (hers, his, theirs) 19. Luisa gets a stick. That is __.(theirs, his, hers) 20. We bought school'supplies. These are (ours, theirs,mine)