Final answer:
To complete the sentence about Mrs. Sommers and her day of luxury accurately, context from the narrative is needed, which could suggest a verb like 'dreamed' or another based on her experiences or mindset.
Step-by-step explanation:
The question reflects on Mrs. Sommers's contemplation about her experiences and implies an inquiry into her beliefs or expectations regarding the duration of a period of luxury. To correctly complete the sentence, we would need the context in which the statement is made, as it is not a standalone fact but rather part of a narrative or a character's development in literature. A possible completion could be 'Mrs. Sommers dreamed that her day of luxury would last forever', although the actual verb to use would depend on the specific context of the narrative in question.