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11. This room may be used.
12. The story is going to be told by the teacher.
13. The cake is being cut by Mary.
14. We were given more information by her.
15. This machine musn't be used after 5.30 pm.
16. You will be helped by his father tomorrow.
17. Human life has been changed by science and technology.
18. This bottle was broken by Peter.
19. English is being learned in the room by them.
20. Many flowers are planted in the garden by us.