9.In manufacturing,cheaper materials are constantly being substituted _____ the better,more expensive kind.A.for B.by C.with D.out10.A bad cold may _ to pneumonia.A.lead B.cause C.result D.give

9.In manufacturing,cheaper materials are constantly being substituted ___________ the better,more expensive kind.A.for B.by C.with D.out10.A bad cold may _______ to pneumonia.A.lead B.cause C.result D.give

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