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EX 5: chuyển câu sang câu bị động
28. People drink coca-cola in the 21st century.
29. They gave up the research after three hours.
30. Someone should look into the matter.
31. People saw him steal your car.
32. Police advise drivers to use an alternative route.
33. She advised me to sell that house.
34. My pupils can't do these exercises quickly.
35. My mother will make a new dress of silk.
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