Change these sentences into passive voice: a. Vietnam exports a lot of rice. - ....................................................................................................................................... b. Miss Lien wrote the letter last night. - ....................................................................................................................................... c. Lan did her homework for three hours. - ....................................................................................................................................... d. We will buy a new car next week. - ....................................................................................................................................... e. Mrs Mai will finish the work early. - ....................................................................................................................................... 6. People spend a lot of money on advertising every year. - ....................................................................................................................................... 7. The bank manager kept me waiting for half an hour. - ....................................................................................................................................... 8. The teacher gave us two exercise books. - ....................................................................................................................................... 9. The boys broke the windows and took away some pictures. - ....................................................................................................................................... 10. The children looked at the woman with a red had. - ....................................................................................................................................... 1