Задайте разделительные вопросы: 1.Russian researchers have been doing much for the development of metallurgy as a science 2.The main building of our Institute isn't Lenin Street 3.Second-year student will study physical metallu...

1.Russian researchers have been doing much for the development of metallurgy as a science, haven`t they? 2.The main building of our Institute isn't in Lenin Street, is it? 3.A second-year student will study physical metallurgy next year, won`t he? 4.Olga takes many subjects at the Institute, doesn`t she? 5.Students understood a new rule, didn`t they?