Parents of "gaokao" candidates wait outside an exam site of the national college entrance exam at a middle school in Zhengzhou, capital of central China's Henan Province, June 7, 2014. The exam, known as the "gaokao", began on Saturday. A total of 9.39 million people have registered for the exam this year to vie for 6.98 million vacancies in universities and colleges.(Xinhua/Li Bo)