Решение:
Заполним пропуски подходящими притяжательными местоимениями.
- This is my brother's phone. I know it's his.
- They aren't our books. Ours are at home.
- This isn't my pencil case. Mine is yellow.
- Maria's got an MP3 player. This MP3 player is hers.
- They aren't your marker pens. Yours are in your bag.
- It isn't my parents' car. Theirs is black.
Ответ: 1. his; 2. Ours; 3. Mine; 4. hers; 5. Yours; 6. Theirs.