Write the sentences into passive. Leave out the agents 7. Nowadays, people use machines for doing that work.
8. No one can do anything to save him now.
9. The factory workers cut the oineapples into cubes.
10. We leave the plant in the dark for a few days.
11. You ought to report the accident to the police within twenty four hours.
12. They have organised the exoedition well.
13. He offered me a job in his company, but I refused it.
14. They had sent for a doctor, but he had not arrived yet.
15. You must check over every figure in the accounts book.