阅读欧阳修《五代史伶官传序》中的一段文字，回答下面小题。
《书》曰：“满招损，谦得益。”忧劳可以兴国，逸豫可以亡身，自然之理也。故方其盛也，举天下之豪杰，莫能与之争；及其衰也，数十伶人困之，而身死国灭，为天下笑。夫祸患常积于忽微，而智勇多困于所溺，岂独伶人也哉！

自“故方其盛也”至“而身死国灭，为天下笑”一段在文中起什么作用？使用了什么修辞手法？

用括号内所给单词的适当形式填空。  

1. Your friends would probably say you are a good _____ (listen).

2. I find it very _____ (help) to get a first-aid book at hand.

3. He is very _____ (confidence) and he believes he can do everything well.

4. If I felt some pain, I'd stop _____ (exercise).

5. Lizz gave me this ring. She _____ (be) very upset if I lost it.