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______________________________________________________