Change the following sentences into the passive. (Chuyển các câu sau sang bị động) 1. People grow rice in many countries in the world. -> Rice ______________________________________ 2. Graham Bell invented the telephone many years ago. -> The telephone ______________________________ 3. They have used this car for many years. -> This car ___________________________________ 4. Lan practices English every day. -> English ____________________________________ 5. They will take the garbage out of the city. -> The garbage _____________________________ 6. Mary sent me this letter two days ago. -> I _________________________________________ 7. People make compost from vegetables. -> Compost ____________________________________ 8. You must finish this work before Sunday. -> This work _____________________________________ 9. She hasn't used this bicycle for a long time. -> This bicycle __________________________________ 10. I saw a strange man in my garden yesterday. -> A strange man _______________________________ 11. They clean the floor every morning. -> The floor ____________________________________ 12. They will solve the problem soon. -> The problem __________________________________ 13. They break the glass into small pieces. -> The glass ____________________________________ 15. They made these cars in the USA. -> These cars ______________________________________