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Wood has been a highly used 1_______ material since prehistoric times. Among other highly used building materials there are concrete, steel, brick, stone, and plastics. Being the oldest building material, 2_______ is also known to be the only naturally growing organic material. Among other advantages of wood there are its low cost, 3_______ weight, and high workability. But, as any other construction material, wood has its 4_______. The main ones are the following – it is not fire-resistant, it easily burns.