1.When l left the institute i didnt know yet the students had got because their papers...through. .had been looking .were

1. When l left the institute I didn’t know yet the students had got because their papers were being looked through.
2. My friends were travelling in Latin America when they heard the news.
3. Linda is reading the newspaper. She has been reading it for two hours.
4. India has been an independent country since 1947.
5. I didn’t know who she was. I had never seen her before.
6. The house was dirty. They haven’t cleaned it for weeks.
7. I ate a piece of chocolate cake. — A piece of chocolate cake was eaten by me.