Помогите пожалуйста прошу

1.These are cheap shoes in the shop.They`re only 10 euros.
2.Ferrari makes expensive cars in the world.
3.He`s a scientist and an inventor.He`s intelligent person i know
4.I think he`s attractive boy in the class.He`s got a lovely eyes.
5.Are snails slow animals in the world

1. the cheapest
2. the most expensive
3. the most intelligent
4. the most attractive
5. the most slowly