_________(54)A.strength B.protectionC.alertness D

_________(54)A.seal B.selectC.support D.delete

_________(54)A.best B.leaseC.most D.worst

_________(54)A.recorders B.antennasC.cameras D.se

_________(54)A.so B.asC.thus D.with

_________(54)A.these B.thatC.what D.which

_________(56)A.strength B.laborC.abuse D.exercise