HE Secretary General of the Ministry of Foreign Affairs Dr Ahmed bin Hassan Al Hammadi held on Wednesday a farewell ceremony in honor of HE the Ambassador of the People's Republic of China to the State of Qatar Li Chen, HE the Ambassador of Australia to the State of Qatar Axel Wabenhorst and HE the Ambassador of the Republic of Burkina Faso Adama Compaore, on the occasion of ending their tenure in the country.