Mrs. Smith locked both the front and the back doors before she went to bed______thatsomeone might steal into the house at night.
A、soD
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Notallbirdscanfly,______doallbirdsbuildnests.
In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
Thehostsapologizedfor______thatsomeoftheirguestsmightbevegetarians.
Onarrivinghome,theboytoldhisparentsaboutallthe______whichoccurredinhisdormitory.
OneoftheresponsibilitiesoftheCoastGuardistomakesurethatallships______followtrafficrulesinbusyharbors.
