Before paper was invented，people wrote or drew on materials such as bamboo，silk，animal hide，and wooden blocks.Writing materials were really expensive and few people learned to read.Therefore，few people wrote.This all changed，thanks to an man named Cai Lun.
    Paper had already existed （存在） in China ，but the process for producing it was difficult and the paper was of low quality.Cai Lun began experimenting（實(shí)驗(yàn)）with many different materials and different methods to turn those materials into paper.In the year 105，he made it from tree bark，bamboo，cloth rags，and fishing nets.His paper was stronger and cheaper than any paper that had been made before.
    With Cai Lun's paper-making method，Chinese culture grew more rapidly over the next several centuries.That's because ideas were much easier to share with more people who learned to read.The use of paper spread abroad，helping other cultures record and spread their ideas.Today，Cai Lun is considered as a national hero in China.But the whole world should remember the clever Chinese papermaker forever.

（1）People often wrote or drew on materials such as

bamboo

bamboo

，silk，animal hide and

wooden

wooden

blocks before the paper was invented .
（2）Few people wrote because writing materials were really

expensive

expensive

.
（3）According to paragraph 2，it was difficult

to produce

to produce

the paper and the paper was of low quality at that time.
（4）With Cai Lun's paper-making method，Chinese culture grew more rapidly over the next

hundreds of years

hundreds of years

years.
（5）According to the author's idea ，Cai Lun should not

only

only

be remembered by Chinese，

but

but

also the whole world.