Choose the right form of the pronouns: 1. It may be ( our, ours ) books. 2. He has not read a line of ( yours, your ).

1. It may be our books. 2. He has not read a line of yours. How can he criticise your poems? 3. His composition is much more interesting than yours or mine. 4. Their knowledge of the subject is not much superior to ours. 5. I’m afraid they will take her advice not yours. 6. This is your notebook, but where is mine? 

1. These are my pens and those are your pencils. 2. These are his desks and those are hers. 3. These are my books and those are theirs. 4. Are these my books? 5. Are those houses yours? Those houses are mine.