I. Change the following sentences into passive ones: 1. Wastes from chemical factories have caused a lot of pollution. => A lot of ......................................................................................................... 2. That young doctor is looking after a lot of patients. => A lot of ......................................................................................................... 3. It is believed that the thieves got into the house through the window. => The thieves ......................................................................................... 4. When does he usually do his homework ? => When ........................................................................................ 5. I got Nam to wash my clothes. => I got ................................................................................................................ 6. Mrs. Hoa had her daughter cook the meal. => Mrs. Hoa ................................................................................................................................... 7. Peole says that he is intelligent. => He ............................................................................................................................................... 8. They are painting the wall in the school. => The wall ......................................................................................................................................... 9. People have developed many different paper products. => Many .............................................................................................................................................. 10. He asked us many difficult questions. => We ................................................................................................................................................ 11. They must widen the road soon. => The ............................................................................................................................................. 12. She advised me to reuse milk bottles. => I ..................................................................................................................................................... 13. I used to help him. => He .................................................................................................................................................... 14. We are taking photos in the garden. => Photos .............................................................................................................................................. 15. They are going to build a school here. => A school ............................................................................................................................................ mình cần gấp ạ: