12. The chief engineer was instructing all the workers of the plan.  13. They can’t make tea with cold water.  14. Somebody has taken some of my books away.  15. They will hold the meeting before May Day.  16. They have to repair the engine of the car.  17. The boys broke the window and took away some pictures.  18. People spend a lot of money on advertising every day.  19. Teacher is going to tell a story.  20. Mary is cutting a cake with a sharp knife.  21. The children looked at the woman with a red hat.

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