câu bị động 26. Mary is cutting a cake with a sharp knife. a. A cake is being cut with a sharp knife by Mary. b. A cake is cut with a sharp knife by Mary. c. A sharp knife is cut with a cake by Mary. d. A & C are correct. 27. Somebody has taken some of my books away. a. Some of my books have been taken away. b. Some of my books have taken away. c. Some of my books away have taken. d. Some of my books taken away. 28. People spend a lot of money on advertising every day. a. A lot of money is spent on advertising every day. b. A lot of money spent on advertising every day. c. On advertising a lot of money is spent every day. d. On advertising is spent a lot of money every day. 29. They have provided the victims with food and clothing. a. The victims have provided them with food and clothing. b. The victims have been provided them with food and clothing. c . The victims have been provided with food and clothing. d. B & C are correct. 30. You mustn’t use this machine after 5.30. a. This machine mustn’t be used after 5.30. b. This machine mustn’t used after 5.30. c. You mustn’t be used this machine after 5.30. d. A & C are correct.