Students hold their diplomas of the Chinese Proficiency Test, also known as HSK, during a ceremony marking the fifth anniversary of the Confucius Institute at the University of Novi Sad, in Novi Sad, Serbia, on May 24, 2019. Students of the Confucius Institute at the University of Novi Sad demonstrated their language skills and arts at a ceremony marking the fifth anniversary of the institute on Friday. (Xinhua/Nemanja Cabric)