In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
Becauseofthebadweather,thesportsmeethadtobe________.
Notuntilrecently_____thatThompsonhadbentellingthetruthallalong.
OneoftheresponsibilitiesoftheCoastGuardistomakesurethatallships______followtrafficrulesinbusyharbors.
Whilecrossingthemountainarea,allthemencarriedgunslestthey______bywildanimals.
