Решение:
- This book are thin.
- What colour are these pens?
- This house is of modern design.
- This is our classroom.
- What is his father?
- What are these?
- Where are their parents?
- They are busy with their lessons.
- This is their flat.
- What colour are the walls in the room? Their walls are grey.
Ответ: This; these; This; This; his; these; their; their; their; Their.