阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
Kite flying dated from China and became popular around the country. With a long history, it is considered as the 61 (early) aircraft we have ever known. Kites were used for military(军事的)purposes in the very beginning, such as measurement and signaling. Later kite flying gradually became62 outdoor activity for both recreation and art.
In the past, people fastened bamboo-made whistles onto a kite. While 63 (fly) through the wind, it produced sound like the music produced by gu-zheng, 64 is a traditional Chinese musical instrument. Therefore, kite has 65 (it) modern name as fengzheng.
In the 7th century, kite 66 (introduce)to neighboring countries including Korea and Japan. Around the 13th century, Marco Polo introduced it to Europe and Arab countries.
Around the Qingming Festival, 67 (usual) on early April, many people fly kites in public squares. The sky is dotted with kites of different 68 (design), such as dancing butterflies, bounding dragons, and swimming fish. When people look at those kites, they feel as if they are flying away with the kites 69 (escape) the noisy world and step into the nature with their body and soul. It is a way for people to pray for blessings and good luck.
The traditional Chinese kite expresses harmony 70 human and nature, a long-held belief treasured by the Chinese people.
