Thisriverissobigthatitisimpossibletobuilda_______underitwithoutmoderntechnology.
A、canalSometimesitisverydifficultto_______someoftheEnglishwords.Eventhenativespeakercannothelp.
Carelessnessmadehimfallinhisjob_______.
Weare_______attherapidprogressMarkhasmadeinthissemester.
Asateacher,youshouldnot_______thestudentsfromaskingquestionsinclass.
SomestatesintheUnitedStates_______peopletocarryguns.
