Completar frases used to, used for or used as?Versión en línea Fill in: tobe + used to, used for or used as por Ellen Schreurs 1 Tasers incapacitate suspects without serious injury . Personal identification Numbers protect cards from criminal use . Tagging monitor convicted criminals . Anti - virus software protect computers . Face - recognition devices admit only the right people . A helmet head protection . Batons keep people at a safe distance . A GPS help people know exactly where they are . Torches signalling devices . Luggage X - ray equipment help protect air travellers .
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