Chuyển các câu sau sang thể bị động

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Chuyển các câu sau sang thể bị động
1. Mary types some letters in the office.
2. My father waters this flower every morning.
3. Lucy feeds her cat several times a day.
4. Students do their homework every day.
5. Mary and Marcus cut the customers' hair.
6. He always hides the broken cups in the drawer.
7. Some people believe 13 as an unlucky number.
8. They say that John is the brightest student in class.
9. People speak English all over the world.
10. They keep this room tidy all the time.
11. How many languages do they speak in Canada?
12. My mother cooks dinner every night.
13. My company spend a lot of money on advertising every day.
14. They make him work all day.
15. She often takes her dog for a walk.
16. Do they teach English here?
17. What time do you serve dinner?
18. After class, one of the students always erases the chalk board.
19. The boys usually picks her up.
20. She arranges the books on the shelf every weekend.