Посмотрите пожалуйста, правильно ли я выделила в сложноподчиненных предложениях придаточные предложения:
1. Substances can be divided into two classes: electrolytes «whose solutions conduct electricity» and non-electrolytes «whose solutions do not conduct electricity».
2. He would have used the device «if it had been in order».
3. The University «he studies at» is one of the leading educational institutions in our country.
4. The miscellaneous file contains documents «which do not require a separate file».