Sentence:  Civil Defense has far to go and many problems to solve , but <WSD>is</WSD> it not in the best spirit of our pioneer tradition to be not only willing , but prepared to care for our own families and help our neighbors in any disaster - storm , flood , accident or even war ? 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)