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1． (build) about 2,600 years ago to stop enemies and floods, the Qi Wall, the oldest existing Great Wall in China, runs across Shandong Province for 641 kilometers.

In the 1970s, parts of the earth wall 2． (dig) out and used by farmers for their land. Since the early 1990s the government has taken measures to protect it.

In recent years, rapid development and 3． (construct) have brought many new challenges to the protection of the Qi Wall. To fix the problems, Shandong Province has passed a new rule, 4． calls for regional cooperation in the protection work. A 5． (power) system has been set up, using information platforms and other hi-tech means 6． (monitor) the Qi Wall and its surrounding environment.

So far Shandong 7． (increase) 860 patrol (巡逻) posts in seven cities along the Qi Wall, mainly employing farmers living nearby. Guo Jialian, one of the patrolmen, spends around two hours every day walking along a section of the Qi Wall and examining it 8． (close). “I need to check 9． there is any damage to the wall that is caused by people digging earth from it. We all know the wall is a cultural relic (遗迹) that is well worth 10． (protect)," says Guo, adding that he often sees tourists coming to visit the ancient structure.