Final answer:
It is speculative to answer what Krista did when her history teacher fell asleep as there is no specific text reference provided. This situation could be part of a narrative discussed in an English class, focusing on character and plot analysis.
Step-by-step explanation:
The scenario described appears to be based on a situation involving classroom behavior and the dynamics between students and teachers. Unfortunately, without a specific reference from a piece of literature or a definitive context, any response would be speculative.
This type of situation could be part of a narrative or a storyline in an English class, examining characters' responses to unexpected events and interpersonal dynamics. However, since no text passage clearly indicates what Krista's actions were when her history teacher fell asleep during her presentation, it is impossible to provide an accurate answer.
Discussions of classroom behavior, teacher-student relations, and hypothetical scenarios like this one can often be found in literature or English classes to analyze character development, plot, or themes within a given story. If this question relates to a specific text not provided, please reference the relevant text for an accurate response.