Решение:
Заполняем пропуски подходящими притяжательными местоимениями, основываясь на предыдущих предложениях.
- Ilya has got a bottle of lemonade. It's his.
- I've got a red schoolbag. It's mine.
- Dmitry's sister has got five dolls. They're hers.
- This is Olga's sandwich. It's hers.
- You've got a packet of flour. It's yours.
- We've got a big house. It's ours.
- They've got new dresses. They're theirs.
- Roman has got some new toys. They're his.
Ответ: his; mine; hers; hers; yours; ours; theirs; his.