Переведите предложения на язык.определите в каждом из них видо-временную форму и залог глагола-сказуемого. 1. when much had been done in the study of ecology by our institute it became an important scientific center. 2 a curriculum of the new type of secondary school is offered by the ministry of education 3 the research of planets will be developed with the help of cosmic apparatus. 4. this material is unaffected by solar radiation.
