________they'vegottoknoweachotheralittlebetter,theygetalongjustfine.
A、DuetoIfyouwanttofindadecentlocationforyourownhome,________Mr.Smithforadvice.
Humanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.
SinceWilliamhadbeenseriouslyillforseveralmonths,hisparentswereworriedabout________toreturntoschoolfull-time.
Theoppositionleaders________thegovernmentfornottakingactionsooner.
Whenhesuddenly________upthesubjectofgeneticengineering,therewasanembarrassedsilence.
