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1).Mary is younger than Tom.2).My grandfather is older than my grandmother.3).This book is the heaviest of all.4).Her hair is lighter than this.5).Oleg is the tallest of all in our class.6).My sister is smaller than his.7).Our house is the biggest in our street.8).This book is more interesting than that,but this one is the most interesting.9).A mouse is smaller than a cat.10).This dress is more expensive than that one,but this is the most expensive of all.