CMy granddaughter, 10, was very happy the day before yesterday because her mother and the mother of one of her classmates took them to a park and a Pizza Hut （比萨饼屋）to celebrate Children’s Day. For a whole day, the two girls played heartily – no homework, no extra-curricular(课外) skills training. The happy life lasted only for one day. Yesterday, everything returned to normal: doing homework till late at night and going over lessons learned at last weekend’s English and “ Olympic mathematics” (数学奥赛) courses.Every time I went to my daughter’s house in the evening, I saw my granddaughter sitting by the small desk in her room doing math exercises or writing a compositions given by her teacher. On the white wall behind the desk are some words she wrote. One sentence reads: “ Why is the exercise endless?”Poor girl!Although teachers have stopped giving after-school homework to primary school children, parents have been forcing their kids to take part in different kinds of extra-curricular training courses-learning English, painting, music instrument (乐器), weiqi, “ Olympic mathematics” and so on, every Saturday and Sunday.Are these extra-curricular courses really necessary in children’s education? The answer is certainly “ No”. Take the so-called “ Olympic mathematics” for example. These courses are very difficult for the children to understand. Often, they are difficult even for adults (成年人).( ) 61. The writer’s granddaughter celebrated her Children’s Day by _____.