Jawaban:

Paper (1) is produced from wood. The fiber of wood from trees (2) are mixed with water until they becomes a soft wet pulp, which (3) dried. This method of paper-making (4) was invented in the 2nd century BC in China. However, early writing material (5) isn't always from wood. In fact, the word paper comes from papyrus plants which (6) is used by the Egyptians to make a form of paper in 3,000 B.C. When machines for-paper making (7) were introduced 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) is added to make the paper white. Recycling is important, because chlorine (9) is used and less energy (10) is needed for recycled paper.