During the traditional wedding ceremony, the bridal couple promises each other lifelong 【M1】 ______ devotion. Yet, about one cut of four American marriages ends in divorce. Since 1940, the divorce rate has mom than doubled, and experts predict that, of all marriages that occured in the 1970s, about 50% will end in 【M2】 ______ divorce. The USA is one of the highest divorce 【M3】 ______ rates in the world; perhaps even the highest. What goes wrong? That fact that divorce is so common in the United States does not mean that