Chuyển các câu sang câu bị động 
 
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28. Has Tom
Has the work been finished by Tom
29. Did the teacher give some exercises?
exercises given by the teacher
30. Have they changed the window of the laboratory
window of the Laboratory been
31. Is she going to write a poem?
32. Is she making big cakes for the party?
33. Are the police making inquires about the thief
34. Must we finish the test before ten?
35. Will buses bring the children home?
36. Have you finished your homework?
37. Why didn't they help him?
38. How many games has the team played?
39. Where do people speak English?
40. Who are they keeping in the kitchen?