阅读下面材料，在空格处填入适当的内容（1个单词）或使用括号中单词的正确形式。 If including inter-state sections, those not protecting the northern border of China, the oldest _____56____(exist) section of the Great Wall of China was the Qi State "Great Wall". It stretches for over 500 kilometers (300 miles) from the Yellow River at Jinan eastwards to the East China Sea, almost ___57____(divide) Shandong Province in half. The "Great Wall" of the Qi State was ___58____(initial) built around 650 BC, and expended during the Warring States Period (475–221 BC). Before the Qi State Wall was built, natural barriers, i.e. rivers and mountain ranges, formed ____59_____ only defensible boundaries between territories as barriers ___60____ enemies. The State of Qi built its Great-Wall-esque military barrier along its southern border to prevent attacks from the State of Lu and the State of Chu. However, rapid development and ____61____(construct) have brought many new problems and challenges in protecting the wall. ____62____ is necessary to provide a solid legal guarantee for its conservation. To tackle the challenges, Shandong Province has passed a regulation protecting the structure____63____will take effect on Jan. 1. This year, Shandong has added 860 patrol posts in seven cities along the Qi wall, mainly recruiting farmers living nearby. Guo Jialian has been patrolling the section of the wall in Guangli village for three months. "I need to check ____64______ there is any damage to the wall that is caused by people digging earth from it. Awareness of protecting the Qi wall _____65_____ (enhance) in recent years. We all know the wall is a cultural relic," says Guo, adding that he frequently sees tourists coming to visit the ancient structure.

如果包括那些不保护中国北部边境的州际部分，那么中国长城最古老的部分是齐州的“长城”。它从济南黄河向东延伸了500公里（300英里），几乎将山东省一分为二。齐州的“长城”最初建于公元前650年，在战国时期（公元475-221年）扩建。在齐州长城建成之前，自然障碍，即河流和山脉，是领土之间的唯一可防御的边界。齐州在其南部边界上修建了类似长城的军事屏障，以防御鲁州和楚州的攻击。然而，快速发展和建设带来了许多新的问题和挑战，保护长城。需要为其保护提供坚实的法律保证。为应对挑战，山东省已经通过了一项将于1月1日生效的保护结构的规定。今年，山东在齐长城沿线的七个城市增加了860个巡逻站，主要招募附近的农民。郭家联在广里村的一段长城上巡逻了三个月。“我需要检查长城是否有人从中挖土而造成的损坏。近年来，保护齐长城的意识有所提高。我们都知