用represent, on behalf of或stand for的适当形式完成句子
①他代表我们学校参加了比赛，我们所有的人都为他感到骄傲。
He ________________ our school to take part in the competition and all of us were proud of him.
②我代表每个在这里的人，祝愿你们假期愉快。
________________everyone here, I wish you a very happy holiday.
③＂E＂这个字母代表什么?
What does the letter ＂E＂ ________________?