Iftheoperation________carefullyprepared,itwouldnothavebeensuccessful.
句子写作：TodayatschoolMrMoorebroughtinhispetrabbit.Heshowedittotheclass.
Two-thirdsofhisproperty_____lostinthefire.
句子写作：Thepianoplayerbegantosingloudly.
CharlesSmith,______wasmyformerteacher,retiredlastyear.
