President Xi Jinping met with Chief Executive of the Hong Kong Special Administrative Region (HKSAR) Carrie Lam here on Thursday, saying the central authorities fully acknowledge her work during her five-year tenure as the chief executive.Xi is in Hong Kong to attend events marking the 25th anniversary of Hong Kong's return to the motherland.President Xi Jinping met with Chief Executive of the Hong Kong Special Administrative Region (HKSAR) Carrie Lam here on Thursday, saying the central authorities fully acknowledge her work during her five-year tenure as the chief executive.Xi is in Hong Kong to attend events marking the 25th anniversary of Hong Kong's return to the motherland.