Thesemachinesarenot(efficiency)____________atall;theywastemealotoftime.
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Vitaminsarebelievedbymanypeopletobe(benefit)____________toourhealth.
Thoughhewasbornwithahearing(defective)__________,henevergaveup.
Theyhad(installation)____________anewphonelineintheirapartment.
Doctorsandengineersarehighly(profession)____________people.
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