Vehicles run under Chinese national flags and flags of Hong Kong Special Administrative Region in Tsim Sha Tsui of Hong Kong, south China, June 27, 2017. July 1, 2017 marks the 20th anniversary of Hong Kong's return to the motherland. (Xinhua/Lo Ping Fai)
A car drives under Chinese national flags and flags of Hong Kong Special Administrative Region in Tsim Sha Tsui of Hong Kong, south China, June 27, 2017. July 1, 2017 marks the 20th anniversary of Hong Kong's return to the motherland. (Xinhua/Lo Ping Fai)
Photo taken on June 27, 2017 shows a building with light installations to celebrate the 20th anniversary of Hong Kong's return to the motherland, in Hong Kong, south China, June 27, 2017. (Xinhua/Wang Xi)
Photo taken on June 27, 2017 shows celebration posters in Admiralty of Hong Kong, south China. July 1, 2017 marks the 20th anniversary of Hong Kong's return to the motherland. (Xinhua/Hou Dongtao)
A bus painted with patterns marking the 20th anniversary of Hong Kong's return to the motherland drives on a street in Central of Hong Kong, south China, June 27, 2017. (Xinhua/Wang Xi)
Photo taken on June 27, 2017 shows celebration posters at Tamar Park in Hong Kong, south China. July 1, 2017 marks the 20th anniversary of Hong Kong's return to the motherland. (Xinhua/Liu Yun)
Photo taken on June 27, 2017 shows a giant screen displaying words on celebrating the 20th anniversary of Hong Kong's return to the motherland in Tsim Sha Tsui of Hong Kong, south China. (Xinhua/Wang Xi)
