1) If we are deprived _____ sleep, our performance decreases. a) of b) in c) on 2) Stress adds ____ absent-mindedness a) on b) in c) to 3) There's a reduction ____ working memory as we get older. a) in b) on c) at 4) We shoild keep our brains fit instead _____ worrying about getting old. a) at b) in c) of 5) We need to keep ____ mind stimulation when we think about keeping our brains fit. a) in b) on c) under 6) Learning new activities results _____ more brain connections a) of b) in c) on

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