The problem ________ when the students refused to do their homework.
A
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SinceWilliamhadbeenseriouslyillforseveralmonths,hisparentswereworriedabout________toreturntoschoolfull-time.
Sixtypercentoftelevisionviewerschosehimastheir_______actor.
Thewealthofacountryshouldbemeasured________thehealthandhappinessofitspeopleaswellasthematerialgoodsitcanproduce.
Theaddressbook________theemailaddressesofyourfriendsorgroupsofcolleagues.
Inthefuture,more______shouldbeplacedontheeducationoftheyoung.