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Yes, the missing form is indeed "prosaically." The word "prosaically" is an adverb derived from the adjective "prosaic." In this sentence, "prosaically" is used to describe the manner in which the governor delivered the important message. It suggests that the delivery was rather plain, dull, or lacking in imagination. To know this, you can identify the missing adverb by considering the context and the form of the adjective "prosaic." By adding the suffix "-ally" to the adjective, you create the corresponding adverb form, "prosaically."