Use of English · Parte 3
Almost everyone has experienced an (0) OCCASIONAL (OCCASION) poor night's sleep due to worries, an impending (1) .......... (DEAD), or a sick child. For at least 10 per cent of the adult population, though, insomnia is a chronic and burdensome problem. It is also the most (2) .......... (PREVAIL) of all sleep…
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