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

1. Interesting results were obtained after a number of experiments.(Past Simple Passive) 2. Searching for ore with plants started a new trend in geology (Past Simple Active) 3. Later generations will regard Antarctica as the natural storehouse of food .(Future Simple Active) 4. Modern science and inventions have made a great change in the techniques of exploration (Present Perfect Active)