磷酸可待因注射液的含量测定方法是
Itrainedhardyesterday,______preventedmefromgoingtothepark.
Homingpigeonisusefulasa______carrierbecausewhentakenfromhome,itwillreturnatthefirstopportunity.
Thatproposalisessentiallyirrelevant________theissueathand.
Veryfewpeopleunderstoodthiscontract,______wasveryobscure.
Ifyou_______inbehavinginthiswayyouwillbringyourselfnothingbuttrouble.
Peoplewhocan’t_______betweencolorsaresaidtobecolor-blind.
In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
ForelectoralpurposesBritainisdividedinto659constituencies,eachofwhichreturns________totheHouseofCommons.
Mrs.Smithlockedboththefrontandthebackdoorsbeforeshewenttobed______thatsomeonemightstealintothehouseatnight.
_______,couldyougetmeaTurkishconversationbook?