Complete the sentences with the superlative form of these adjectives. intelligent/slow/cheap/expensive/attractive It

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