Her elder sister is much ____________ than she is. (slim; slimmer)
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The little girl has become much ____________ and ____________ than before. (tall, heavy; taller, heavier)
Even the grass growing here look ____________ and ____________ than in the mountains. (thinner, weaker; more thin, worse)
The situation went from bad to ____________. (bad; worse)
What a pity! The water in the river has become ____________ than before.(dirty; dirtier)