Подвергается ли Na коррозии?

Помогите передать в passive voice пожалуйста=) 

1. We received this letter after his departure. 2. Have dogs ever attacked you? 3. Bees gather honey from flowers. 4. The storm drove the ship against a rock. 5. Who discovered the circulation of blood? 6. They are selling delicious fruit ice cream there now. 7. The old man showed us the way out of the wood. 8. They offered her some interesting work. 9. The doctor prescribed her new medicine. 10. They often speak about him. 11. Everybody laughed at this funny animal. 12. We have been looking for you the whole morn­ing. 13. We shall insist on strict discipline. 14. They teach three foreign languages at this school.

просклоняйте местоимение оно