A, Scientists need to continue studying what happens to players who get hit in the head.
A Clarity because clarity means the same as "how clearly". Or the measurement of "how clear something is", like the clarity of water. If you practiced new Vocab words with good clarity or with clarity, it means you understand them and can spell them well.
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If I keep spending more money than I am earning, my bank account will continue depleting.
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Depleting means reduction in something or act of reducing it .