Chui Sai On, the fourth-term chief executive of the Macao Special Administrative Region (SAR), delivers a speech at an inauguration ceremony and a celebration gathering marking the 15th anniversary of Macao's return to the motherland in Macao, south China, Dec. 20, 2014. Chinese President Xi Jinping attended the celebration gathering and the inauguration of the fourth-term chief executive and government of the Macao SAR on Saturday morning. (Xinhua/Cheong Kam Ka)