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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 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
2.The main building of our Institute isn't Lenin Street
3.Second-year student will study physical metallurgy next year
4.Olga takes many subjects at the Institute
5.Students understood a new rule
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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?