Chuyển câu cho nghĩa không đổi

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10. Mary is cutting the cake with a sharp knife.>
11. The children looked at the women with a red hat.>
12. They have provided the victims with food and clothing.>
13. The teacher explains the lesson.-
14. Mrs Green is cooking the food in the kitchen.>
15. The doctor examined the patients.>
16. These boys made that noise.
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17. People speak English all over the world.
18. He gave him back the money last Sunday.
19. I can't do these exercises quickly.
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20. She had finished the report by noon.