Choose if each sentence requires a possessive adjective or a possessive pronoun: 1. She's not his friend, she's . . . (my/mine). 2. Robert didn't drink his own coffee. He drank (her/hers). 3. That is one of (her/hers) friends. 4. His grandfather is old, while (my/mine) grandfather isn't. 5. Did (your/yours) mother play volleyball? 6. I don't know (their/theirs) daughter very well. 7. I talked to (my/mine) grandmother for three hours last night. 8. I think I got my books mixed up with (your/yours). 9. Julia's hair is shorter than (my/mine). 10. Their children are older than (our/ours). ​