Решение:
- My young brother is a person in my family.
- This shop is cheap in the city.
- The cheetah is a fast animal in the world.
- Summer is a hot season of the year.
- My bedroom is small room in my flat.
- History is a bad subject of all.
- Winter is a good season of the year.
- I am a thin person in my family.
- My dad is a strong person, I know.
- My shoes are dirty of all.
- Whales are big animals in the world.
Ответ: young; cheap; fast; hot; small; bad; good; thin; strong; dirty; big.