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)

2 . Doing exercise is b________ to our health.

3 . Your sweater is i________ to mine in style.

4 . You should be________ (谨慎) about what you say in public.

5 . The issues being discussed here are very common, so they're not u________ to the US.

6 . His mind is ____ (心不在焉).