4. Turn into passive voice : 1. Someone has sent me the flowers …………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………… 2. My mother has made that cake. ……………………………………………………………………………………………………… 3. Somebody has taken some of my books away …………………………………………………………………………………….. 4. They have provided the victims with food and clothings …………………………………………………………………………. 5. They have made mistakes in their composition. ………………………………………………………………………………….. 6. Have they changed the window of the laboratory? …………………………………………………………………………………? 7. Has Tom finished the work ? ……………………………………………………………………………………………………….? 8. No one has done these exercises …………………………………………………………………………………………………….. 9. Nam has already finished this work …………………………………………………………………………………………………. 10. Mai has given two sisters two dictionaries ………………………………………………………………………………………… 11. They have waited for the doctor …………………………………………………………………………………………………… 12. I have just seen my sister in the park ……………………………………………………………………………………………… 13. Daisy has read that novel several times …………………………………………………………………………………………… 14. They have studied English since 1999 ……………………………………………………………………………………………. 15. He has just met him ………………………………………………………………………………………………………………. 16. Nam has already done his exercises ………………………………………………………………………………………………