Yearly is the adverb.
An adverb is a word that modifies verbs, adjectives and other adverbs. In this case "yearly" is modifying "migrate" which is a verb.
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Answer:
Information must be officially confirmed by a government office.
Explanation:
At times when the country is embroiled in conflict, it is common to get the wrong rumors about whether the government will go to war or not. Many people, in order to generate fear in the population, may disclose that the country goes into war or some other kind of conflict, however it is important not to listen to rumors and wait for official information from the government.
Roosevelt talked about this in fireside chat # 19, where he said that in times of crisis, before war information is released to the American people, information must be officially confirmed by a government office.
