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 Forbidden City in Beijing , home to the Palace Museum , houses more than 1. 8 million cultural relics and is one of the world’s most visited tourist attractions. 1 (mark) the 600th anniversary of the Forbidden City , the Palace Museum will hold a series of events throughout 2020. Over 20 exhibitions will be held, 2 (cover) different areas such as history , art , festivals, and so on. For the special occasion, Along the River During the Qingming Festival, one of China’s most 3 (wide) known masterpieces, will go on display in September 2020. For 4 (it) best preservation, this treasured artwork is seldom fully exhibited. The painting 5 (display) for the first time back in 2005 to celebrate the museum's 80th anniversary. Such 6 rare sight is expected to draw huge crowds. In addition to Chinese relics , the museum will also display exhibits from other 7 (country). During the past few years, the Palace Museum has been working hard to get the public familiar 8 the history and culture of the Forbidden City. And it seems that these efforts have been paying off , with its 9 (popular) reaching new heights. Over 17 million people visited the museum in 2018 , of 10 40 percent were under 30 years old.