________ he driven more carefully, the accident would not have happened the other day.A. Be B. Had C. Has D. Would have
Wehaveto________thewheatassoonaspossiblebecauseastormisontheway.
Onceadecisionhasbeenmade,allofusshould______it.
Beforethewarbrokeout,manypeople________insafeplacespossessionstheycouldnottakewiththem.
It’stenyearssincethescientist________onhislife’sworkofdiscoveringthevaluablechemical.
Tokeephealthy,ProfessorJohnson_______cyclingasregularformofexerciseafterheretired.