_________(58)A.by B.onC.in D.for

_________[A] by chance [B] in contrast [C] as usual [D] for instance

_________(62)A.off B.onC.up D.for

_________(54)A.at B.inC.on D.for

_________(60)A.normal B.necessaryC.domestic D.for

_________(63)A.by mistake B.by accidentC.in turn

_________(52)A.to B.onC.in D.back