Подчеркните сказуемое главного предложения и определите видо-временную форму и залог глагола .
1. Interesting results were obtained after a number of experiments.
2. searching for ore with plants started a new trend in geology
3. later generations will regard Antarctica as the natural storehouse of food .
4. modern science and inventions have made a great change in the techniques of exploration

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Interesting results were obtained after a number of experiments. (were obtained - прошедшее время, пассивный залог)searching for ore with plants started a new trend in geology (started - простое настоящее время, активный залог)later generations will regard Antarctica as the natural storehouse of food. (will regard - будущее время, активный залог)modern science and inventions have made a great change in the techniques of exploration (have made - настоящее совершенное время, активный залог)