6) Underline the correct comparative or superlative form of the adjective in brackets.
Winter is the colder/the coldest time of the year.
Caroline works harder / the hardest than Tom.
Her shoes were more expensive / the most expensive than mine.
Germany is bigger / the biggest country in the world.
It's hotter / the hottest in Italy than in Norway.
She's better/ the best student in the class.
I'm younger / the youngest than my brother.
I think the mountains are more beautiful/the most beautiful than the sea.​