Humanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.
Ifyouwanttofindadecentlocationforyourownhome,________Mr.Smithforadvice.
EachyearintheUnitedStates,manyblackteenagers_______ofschool,eitherbecausetheycannotkeepuportheyhavetoworktosupporttheirfamily.
Thestudentfoundthenovel_______.Itprovidedhimwithsomuchinformationaboutthesubject.
SinceWilliamhadbeenseriouslyillforseveralmonths,hisparentswereworriedabout________toreturntoschoolfull-time.