Paraphrase the sentences using than or as...as
1)Sam is nastier than Dave (Dave/nice/Sam)
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2)English isn't as difficult as French (English/easy/French)
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3)This book is more boring than that book (That book/interesting/this book)
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4)French isn't as boring as science(French/interesting/science)
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5)Documentaries aren*t as boring as current affairs programmes(documentaries/interesting/current affairs programmes)