Theprofessorworkedfor7hoursata________.
Youshouldhelpthem________whenyourfriendsquarrelwitheachother.
TheMississippi,whichissometimescalled________,hasplayedavitalroleinthehistoryoftheUnitedStates.
Manisa“victimofforcesoverwhichhehasnocontrol.”Thisisanotionheldstronglyby().
Thedevastatingfloodsanddroughtsthatimposedarecurrenttaxofsufferingonthefarmersnolongeroccur.Egyptianagriculturehasbeentransformed,andindustryisbenefitingfrompowergeneratedbythedam.（）
