题目内容：

假如你叫李华，你校英文报下一期专栏的话题是“讲述一件令人难忘的事情”。请根据下面提供的开头部分，发挥你的想象力就此话题续写该短文，然后向该专栏投稿。

要求：1. 文中使用情态动词表示推测的句子至少两句；2. 文中应体现你由恐惧到惊喜的情感变化过程。3. 词数90左右。开头部分已给出，但不计入总词数。

I had a frightening and exciting experience last Thursday night. After finishing my homework, I was going to bed. Just then, I heard the sound of footsteps outside my door. I wondered who it could be. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________