（C）

When you sit down with your family to eat a meal，have you ever wondered when and where people used chopsticks for the first time？

It's said that the first chopsticks were used in China 5，000 years ago．Since then，chopsticks have even widely used in many countries in Asia，such as China，Japan and Korea．Chopsticks are made of different kinds of materials．The materials like bamboo and wood are common because they are easy to get．People also use bones for chopsticks．Even many valuable materials like silver can be used to make chopsticks．There are also many table manners（礼仪） connected with chopsticks．For instance，never stick （插入） your chopsticks straight in your rice bowl．People believe this is impolite to the host．

The Introduction of Chopsticks
When the first chopsticks were used in China	Fifty（76） 　　ago
Where chopsticks have been widely used	In many（77） 　　countries，such as China，Japan and Korea
What materials chopsticks are made of	（78） 　　，wood，bone and silver
Why bamboo and wood chopsticks are common	Because the materials can be found（79）
One of the table manners connected with chopsticks	Never stick your chopsticks straight in your rice （80）

任务5：根据短文（C）内容完成表格，每空一词．