题目内容：

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。

The People's Republic of China marked its 70th anniversary on Tuesday with a series of National Day celebrations at the heart of the country's capital. The massive events in Tian'anmen Square, such as1.unique military parade, massive Pageantry(盛典), 2. (design)to be environmentally3.(friend). The 70-gun salute that kicked off the day’s events4.( include) pollution control technology. According to the Global Times. The result was 5.nearly zero emissions were created by the firing of the 56 cannon shells. The parade concluded6. the release of 70, 000 “peace doves”. They were contributed by local pigeon lovers,7.trained and volunteered their birds for event.8.(answer) a call from the Beijing Carer Pigeon Association.These borrowed birds were trained9.( make) their way home after their release in the center of the city. Some pigeon10.( own) shared photos online of their returning birds. 70,000 colorful balloons were also released. The balloons were made of an eco-friendly and biodegradable plastic.