Answer: 1. "Craziest" is an adjective.
2. "Crazily" is an adverb.
3. "Crazier" is an adjective.
Step-by-step explanation: The three sentences provided present different forms of the word "crazy". In the first sentence, "craziest" is a superlative adjective. "Craziest" has been formed adding the suffix "-est" at the end of the word in order to denote the highest degree of "crazy". On the other hand, in the second sentence, "crazily" is an adverb modifying the verb "danced". Moreover, it has been formed adding the suffix "-ly" at the end of the word. Finally, in the third sentence, "crazier" is a comparative adjective. It has been formed adding the suffix "-er" at the end of the word. Moreover, "crazier" has been used to compare two people: Amber and Andy.