Change the following sentences into the passive. (Chuyển các câu sau sang bị động) 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 ______________________________________ 16. People have used the Internet all over the world.