11. The teacher explains the lesson.

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10. Mary is cutting the cake with a sharp knife.

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9. The teacher is going to tell a story.

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8. They may use this room for the classroom.

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7. People spend a lot of money on advertising every day.

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6.  The boys broke the window and took away some pictures.

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5. They have to repair the engine of the car.

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4. They will hold the meeting before May Day.

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3. Somebody has taken some of my books away.

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2. The chief engineer was instructing all the workers of the plant.

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