Question

Определить видовременную форму и залог глагола сказуемого. 1.when much had been done in the study of ecology by our institute it became an important scientific centre. когда наш институт сделал многое в изучении экологии, он стал важным научным центром. 2 iron filings are most strongly attracted to the poles of the magnet. --железные опилки сильно притягиваются к полюсам магнита. 3. the research of planets will be developed with the help of cosmic apparatus. исследование планет будет проведено с космического аппарата.

Answer 1

1. had been done - past perfect passive, became - past simple active
2  are attracted - pres simp pass
3. will be developed - future simp pass