What a pity! The water in the river has become ____________ than before.(dirty; dirtier)
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The ____________ we operate on him, the ____________ he will recover. ( early,soon; earlier, sooner)
The older generation should also learn to understand the _____________ generation.(young; younger)
This piece of news is ____________ of all for our company. (more important; the most important)
The doctor could treat any patient as _____________ as any doctor. (well; better)