Chuyển những câu sau sang câu bị động:
2. The chief engineer was instructing all the workers of the plant.
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3. Somebody has taken some of my book away.
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4. They will hold the meeting bofore May Day.
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5. They have to repair the engine of the car.
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6. The boys broke window and took away some pictures.
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7. People spend a lot of money on advertising everyday.
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8. They may use this room for the classroom.
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9. The teacher is going to tell a story.
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10. Mary is cutting the cake with a sharp knife.
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