1 . One thing c________ to the increasing number of “urban animals ” is their ability to adapt. (根据首字母单词拼写)
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2 . Doing exercise is b________ to our health.
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3 . Your sweater is i________ to mine in style.
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4 . You should be________ (谨慎) about what you say in public.
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5 . The issues being discussed here are very common, so they're not u________ to the US.
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6 . His mind is ____ (心不在焉).
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