As of December 1, Ira and Sandy will have been going together for three years.

If you mean last December, then it should read "As of December 1, Ira and Sandy have been going together for three years."

If you mean the next time we get to December 1 (in the future), then the verb tense is correct as is.

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Either the interviewer or the committee, usually begins by asking simple questions about your background.

Neither the immigration officials nor have wildlife conservationist been able to find a solution that will protect both the U.S. border and these endangered wildcats.

The verb in this sentence is correct (begins) because "committee" is singular. However, there should not be any commas in the sentence.

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Neither the immigration officials nor wildlife conservationists have been able to find a solution that will protect both the U.S. border and these endangered wildcats.

The phrases "immigration officials" and "wildlife conservationists" (<~~notice that it's plural!) are parallel; both have and adjective and a plural noun.

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Typo!! Should be

...both have an adjective and a plural noun.