Before paper was invented，people wrote or drew on materials such as bamboo，

（1）　　/sɪlk/，animal hide，and wooden blocks．Writing materials were （2）　　（real）expensive and few people learned to read．Therefore，few people wrote．This all changed，thanks （3）　　 a man named Cai Lun．

   Paper had already existed（存在）in China，but the process for （4）　　（produce）it was difficult and the paper was of low quality．Cai Lun began experimenting（试验）with many different materials and different （5）　　（method）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 （6）　　（strong）and cheaper than any paper that had been made before．

With Cai Lun's papermaking method，Chinese culture （7）　　/gru：/ more rapidly over the next several centuries．That's because ideas were much easier to share （8）　　 more people learned to read．The use of paper spread abroad，helping （9）　　/'ʌðə/ cultures record and spread their ideas．Today，Cai Lun is considered a national hero in China．But

（10）　　 whole world should remember the clever Chinese papermaker forever．