Final answer:
The word that completes the sentence about Scout is 'fight.' This illustrates a conflict within a family context in a work of English literature.
Step-by-step explanation:
Scout gets into a fight with her cousin and gets a spanking from her uncle for it. The sentence is referring to a conflict, which in a colloquial sense, can be described as a fight. Since the context of the question suggests family relations and a mention of punishment, the term 'fight' seems to best fit the narrative scenario described. Instances of conflict and their consequences are common themes explored in literature, which help in understanding characters and their interactions. This type of question is typical in studying works of English literature, where analyzing character actions and family dynamics can be part of the learning objectives.