请补充以下空白,听力可以重复3遍。 16、 What ceremony is the speaker addressing? The ______ ceremony of the International Arts Contest. 17、 What opportunity does the contest provide for young people? A good opportunity to ______ their creativity. 18、 How many countries and regions participate in the contest now? ______. 19、 What is the theme of the contest for this year? The theme is ______. 20、 In what way are the photographic works submitted? Through the ______ from overseas.