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    (Uncover 3 unit 7)
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  • The blocks are made of cement (they)
    They make the blocks of cement
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  • The wall is made of bottles (they)
    They make the wall of bottles
  •  15
  • People use car tires to build strong walls
    Car tires are used to build strong walls
  •  15
  • They don't make that bottle of plastic
    That bottle isn't made of plastic
  •  15
  • People don't build the houses with bricks
    The houses aren't built with bricks
  •  15
  • They don't grow cotton in cold places
    The cotton isn't grown in cold places
  •  15
  • Those plastic bottles are recycled to make furniture (he)
    He recycles those plastic bottles to make furniture
  •  15
  • These houses aren't built quickly. It takes a long time. (she)
    She doesn't build these houses quickly. It takes a long time.
  •  15
  • We build it in 1992
    It was built in 1992.
  •  15
  • We updated the appliances two months ago.
    The appliances were updated two months ago.
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  • It was desinged by the museum.
    The museum designed it.
  •  15
  • The most energy was consumed by the heater.
    The heater consumed the most energy.
  •  15