Ii. переделайте следующие предложения, изменив active voiceна passivevoice. : 1. before the experiment we mix the substances in a large cup. 2. we study mathematics and physics in the first year at the institute. 3. we use electricity on a large scale. 4. we shall test the new engine in the laboratory. 5. einstein provided a new conception of time, space and gravitation.
