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1) The tiger was shot with a gun. The tiger was shot by a hunter.
2) The tree was cut down by the city worker. The tree was cut down with a chain saw.
3) The furniture is polished with a piece of cloth. The furniture is polished by the housekeeper.
4) The pie was made with spinach and cheese. The pie was made by Mary's mother.
5) The house has been decorated by Lisa. The house has been decorated with balloons and streamers.