The two instances of situational irony in the passage are:
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“Evidently her reputation as a story-teller did not rank high in their estimation.” - This statement suggests that despite her role as a storyteller, the children do not regard her stories highly, which is ironic given that she is expected to be engaging and entertaining.
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“In a low, confidential voice, interrupted at frequent intervals by loud, petulant questionings from her listeners, she began an unenterprising and deplorably uninteresting story about a little girl who was good.” - The irony here lies in the expectation that a storyteller would capture the audience's attention, yet the story she tells is boring and uninteresting, leading to interruptions from the listeners rather than engagement.
These two examples highlight the contrast between expectations of storytelling and the reality of the children's reaction and the nature of the story itself.