Final answer:
Without further context, it is challenging to determine the secondary characters in the literature provided, as only minimal actions and dialogue are imparted from characters such as Mrs. C and others mentioned.
Step-by-step explanation:
Secondary characters play a supportive role in literature, complimenting the protagonist and helping to advance the plot. Given the passage, while Mrs. C appears to be a secondary character as she provides a minimal backdrop through her singular action of calling a plant "pile wort," it is difficult to designate characters solely based on the given excerpts without additional context about their roles and relevance to the central narrative.
Furthermore, the cryptic dialogue from an unnamed section suggests a collective of possibly peripheral figures like Bert, Sis, and Bill, but again, more context is needed to definitively classify them as secondary characters.