Serving is ________ to your community, but you get a lot out of volunteering, as well. (benefit/beneficial/benefited)
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But all these medications do is dull the brain's ________ of pain. (perception/perceive/perceptive)
Notice what parts of your body are tense, and ________ try to relax them. (conscious/consciousness/consciously)
I have already been to the India and Russia.(改为否定句)
She has watched that movie tiwce.(对划线部分提问)