Whenworkersareorganizedintradeunions,employersfindithardtolaythem________.
A、offWemust______thattheexperimentiscontrolledasrigidlyaspossible.
Iboughtthiseighteenthcenturywritingdeskataquite________price.
I'm______tograduateinthenexthalfoftheyear.
ShegotajobasanassistantstagemanagerattheCambridgeArtsFestivalTheatre,thinkingthatitmight________toacareerasaplaywright(剧作家).
Humanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.
