Final answer:
The correct verb to complete the sentence about Sir Peter's bane is 'was,' indicating that Sir Peter was previously the cause of distress or downfall.
Step-by-step explanation:
The question "Sir Peter ______'s bane?" is asking for the correct verb to complete the sentence, which requires us to understand the tense and context of the statement. Sir Peter is a singular noun and 'bane' refers to something that causes misery or death, often used in a literary or historical context to indicate something that causes ruin or is a source of persistent annoyance.
Given that 'bane' is a noun and we're looking for a verb that suggests something that has happened in the past, the correct answer is:
Sir Peter was ______'s bane?
This suggests that Sir Peter has previously been the cause of distress or downfall for whoever is indicated by the blank in the sentence, and it is a completed action rather than something ongoing or something that he possesses.