——昨天下午同学们去听音乐会了。
——真遗憾！那时候我在做作业。
—Our classmates went to a concert yesterday afternoon.
—What a ____! I was doing my homework.

根据提示完成句子（每空一词）
请原谅我未能更早给你写信。
____ ____ for not writing to you sooner.

根据提示填空（每空一词）
—I lost my MP3 on my way to school this morning.
—It’s a s____!