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  • Нужно переделать предложения, изменив Active voice на Passive voice:
    1. Our scientists worked out the flood defence system some years ago.
    2. You must maintain room temperature at 19° C.
    3. The experimentator will analyse all the data himself.
    4. They make these tools of very hard alloys.
    5. Scientists grew artificial crystals in special laboratories.

  • 1. Our scientists worked out the flood defence system some years ago.--The food defence. system was worked out by our scientists some years ago.
    2. You must maintain room temperature at 19° C.-- Room temperature must be maintained at 19ºC.
    3. The experimenter will analyse all the data himself.-- All the data will be analysed by the experimenter.
    4. They make these tools of very hard alloys.-- These tools are made of hard alloys.
    5. Scientists grew artificial crystals in special laboratories.-- Artificial crystals were grown in special laboratories.