A whale is __________ (large) than a dolphin., larger, largest, Sarah’s room is __________ (clean) in the house., cleaner, cleanest, The new bag is _________(heavy) than my old one., heavier, heaviest, Pollution is one of the __________ (serious) problems on Earth., more serious, most serious, This building is __________ (modern) than the one across the street., more modern, most modern

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