A．Large amounts of newspaper and colored paper.
B．Small pieces of rags or cloth.
C．Old envelops with little printing.
D．Soft wood or bush plants.

A．To mix pulp with water.
B．To keep the shape and thickness of the paper.
C．To keep the paper strong enough.
D．To dry the paper quickly.

A．The cost of making paper.
B．Large machines and paper-making.
C．The development of paper-making.
D．How to make paper by hand today.