wet pulp, which(3)___in the 2nd century BC in China. However, early writing (4)___material (always) from wood. In fact, the word paper comes (5)__from papyrus plants which (6) ___ by the Egyptians to make a form of paper in 3,000 B.C. When machines for-paper making (7) ___ in the 19th century, paper became easy to afford. Today, one of the problems with the huge production of paper is that a chemical called chlorine (8) ___ to make the paper white. Recycling is important, because chlorine (9) ___ and less energy (10)____for recycled paper.
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