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Answer: The complete adverb clause is: If we sell our house
Explanation: An adverb clause begins with an adverb, has to count with a subject and a verb, and cannot be understood by itself. That is, you need to see the rest of the sentence in order to understand meaning. In this case, If ... house is the dependent clause because of the reason explained before (depends on the other clause to be clearly understood)
The city council and mayor do not agree on most policies because to flout means to "openly disregard" meaning the council most likely does not care for the mayors proposals.