помогите сросно пж срочно

2. She's the tallest girl in the class.
3. He's the most clever in the class. (не уверена)
4. It's the fattest animal in the jungle
5. She's the shiest at her family.
6. It's the fastest animal at the world.
Полагаюсь, все правильно. Я писала в самом высочайшем ступене