11. They make these artificial flowers of silk
-> These artificial flowers of silk are made (by them)
12. This well-known library attracts many people.
->Many people are attracted by this well-known library
13. People drink a great deal of tea in England.
-> A great deal of tea is drunk in England
14. People speak English all over the world.
-> English is spoken all over the world
15. She often takes her dog for a walk.
-> Her dog is often taken for a walk by her.
16. They grow coffee in more than 50 countries around the world.
-> Coffee is grown in more than 50 countries around the world.
17. She feeds her dogs twice a day.
-> Her dogs are fed twice a day by her.
18. They open the bank during the weekdays.
-> The bank is opened during the weekdays.
19. My sister cooks meals every day.
-> Meals are cooked by my sister every day.
20. My brother uses a pencil to draw beautiful pictures.
-> A pencil is used to draw beautiful pictures by my brother.