Completar Frases UNIT 5 PASSIVE - ACTIVEVersión en línea Fill in the gaps to complete the active sentences. por Dimitra Athanaseli 1 welcome started wasted identified introduce taken have scientists has to PASSIVE - These unreliable results mean that the lives of the animals involved have been wasted . ACTIVE - These unreliable results mean that scientists the lives of the animals . PASSIVE - These guidelines should therefore be welcomed , although they have taken a long time to be introduced . ACTIVE - Scientists should therefore these guidelines , although the government a long time them . PASSIVE - In 2013 , 4 . 12 million scientific procedures on animals - mostly rats and mice - were started in Great Britain . ACTIVE - In 2013 , in Great Britain 4 . 12 million scientific procedures on animals - mostly rats and mice . PASSIVE - The problem of poorly designed experiments was identified in a recent survey of scientific procedures . ACTIVE - Researchers the problem of poorly designed experiments in a recent survey of scientific papers .
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