Các câu dưới đây từ thể bị động sang thể chủ động
11, people speak English in almost every comet of the world
12, they didn't look after the children properly
13, nobody swept this street last week
14, people drink a great deal of tea in england 
15, the boys broke the window anh took away some pictures
16, people spend a lot of money on advertising everyday 
17, the may use this room for class
18, the teacher is going to tell a story 
19, marr is cutting the cake with a sharp knife
20, she used to pull my has over my eyes