某英文报纸正在举行“我难忘的一次经历”主题征文比赛。假设你曾参加过全校大合唱比赛。请你以“An unforgettable experience”为题，根据下表提示，用英语写一篇短文，准备投稿。 Activity a group singing competition Preparation … Result win the first prize Your feelings e. g. No pains, no gains. 注意：（1）短文须包括上述要点，可适当增加细节，以使行文连贯； （2）文中不得出现真实的人名、校名等个人信息； （3）词数：100左右。开头部分已给出，不计入总词数。 An unforgettable experience During the past year at high school, I have had many unforgettable experiences. One of them was ______________________________________________________