A
2. hers
3. yours
4. theirs; ours
5. mine
B
2. yours
3. mine
4. yours
5. theirs
6. his
7. ours
С
2. Whose camera is this? - It's Marlene's.
3. Whose jacket is this? - It's Matt's.
4. Whose rucksack is this? - It's Liza's.
5. Whose trainers are these? - They're Ben's.