The government must take measures to prevent the river __________.
Heaccidentally_______hehadquarreledwithhiswifeandthathehadn’tbeenhomeforacoupleofweek.
Wehaveto________thewheatassoonaspossiblebecauseastormisontheway.
Onceadecisionhasbeenmade,allofusshould______it.
Beforethewarbrokeout,manypeople________insafeplacespossessionstheycouldnottakewiththem.
It’stenyearssincethescientist________onhislife’sworkofdiscoveringthevaluablechemical.