Theassociationis________toraisingfundstohelptheblind.
A、conductedSinceWilliamhadbeenseriouslyillforseveralmonths,hisparentswereworriedabout________toreturntoschoolfull-time.
Thefarmerhadtowearheavybootsinthewinterbecausethefieldsweretoowetand________.
Hethoroughlyunderstoodthesociety__________.
Theproblem________whenthestudentsrefusedtodotheirhomework.
________somanypeopleintheUnitedStatesbeenoutofworkastoday.
