Comparison of adjectives

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The USA is ________________ country in the world.
more powerful the most powerful
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Who is ________________ player in the team?
the goodest
the best
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Pollution is __________ than 50 years ago.
the worst worse
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London is one of ________________ cities in the world.
the most exciting
most exciting
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He won £1 million. He’s __________ man I know.
the luckyest
the luckiest
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Harry Potter books are _____________ than films.
the most interesting
more interesting
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Could you speak ___________? I can’t hear you.
more loud
louder