阅读下面材料，在空白处填人适当的内容（1个单词）或括号内单词的正确形式。
In the Tibetan language, "Guozhuang dance" means singing and dancing in a circle. It is very popular in Tibet and places like Yunnan, Qinghai and Gansu        Tibetans live. In the dance, men and women of an equal number form a circle hand in hand with  one. person      (act) as the leading dancer.  The whole song begins with slow part. and gradually      (turn) fast. Men always take the first lines of lyrics（抒情歌），      women reply.  The dance involves repeated    (music)dialogues between male and female dancers.
Guozhuang dance is rich  in content and flexible in steps. It changes with the      (develop)of Tibetan life and work,  There are dances concerning daily work    crop gathering, wool twisting, cattle feeding and wine making etc;  And  also there are  dances presenting,     Tibetan customs and marriage traditions.
Guozhuang dance is a joyous dance. Whenever there are festivals or happy events, people of all ages will  (happy) join the dance.  Guozhuang  dance    (catalogue)in the first set of the National Intangible  Cultural Heritage（非物质文化遗产）since 2006．