Fill in the gaps by words [add • dry • introduce invent •mix •not make •not need produce •use (x2)]

Paper (1)
from wood. The fibres of wood from trees (2)
with water until they become a soft
wet pulp, which (3)
This method of paper-making
(4)
in the 2nd century BC in China. However, early
writing material (5)
(always) from
wood. In fact, the word paper comes 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
the paper white. Recycling is important, because chlorine
(9)
and less energy (10)
for recycled paper.