Điền từ thích hợp vào chỗ chấm People was ...........by the Chinese in the first century AD. Most paper is made ...........wood . when trees are ........... they are transported ............. land or water to paper mill . here they are cut ............ and the wood is broken up into fibres . which are ................. with water and chemiscals . this wood pulp is then dried on a machine and .................. into paper One tree is needed for every 400 ............... of a typical forty - page newspaper . If half the adults in Britaint each buy one daily paper , this uses up over 40.000 trees a day . Trees are being cut down faster than they are being .............. so there may be a(n)................. paper shortage before the year 2010