Задание 4. 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 in Lenin Street 3. Second-year students will study physical metallurgy next year. 4. Olga takes many subjects at the Institute. 5. Students understood a new rule.

1. Russian researchers have been doing much for the development of metallurgy as a science,have not they? 2. The main building of our Institute isn’t in Lenin Street,is it? 3. Second-year students will study physical metallurgy next year,will not they? 4. Olga takes many subjects at the Institute,does not she?5. Students understood a new rule,did not they? Пожалуйста.