The answer is a. To show that even seemingly eternal things are temporary,
<span>President John F Kennedy appeal to Americans' sense of patriotism in his inaugural address as h</span>e reminds them that the United States has a long tradition of fighting for freedom at home and around the world.
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Worth, worthy, useful, valuable, profitable, interesting, meaningful, praiseworthy, commendable, rewarding, desirable, laudable, advantageous, noteworthy, creditable, cost-effective, appropriate, notable, suitable, penalty, instrumental, purposeful, substantial.