Fireworks light up the sky during a fireworks show to mark the 20th anniversary of Hong Kong’s return to the motherland in Hong Kong, South China, July 1, 2017.[Photo/Xinhua]

Fireworks light up the sky during a fireworks show to mark the 20th anniversary of Hong Kong’s return to the motherland in Hong Kong, South China, July 1, 2017.[Photo/Xinhua]

Fireworks light up the sky during a fireworks show to mark the 20th anniversary of Hong Kong’s return to the motherland in Hong Kong, South China, July 1, 2017.[Photo/Xinhua]

Fireworks light up the sky during a fireworks show to mark the 20th anniversary of Hong Kong’s return to the motherland in Hong Kong, South China, July 1, 2017. [Photo/Xinhua]