Marriage is, for many people, their most important relationship, the source of much happiness, and, for some, even adds extra years to their life. While the【C1】______between marriage and well-being has been【C2】______studied, predicting marital success is【C3】______. Exactly which people are likely to make successful 【C4】______and what can they do to【C5】______the odds of being successful and happy in marriage? "The state of marriage is that it's going in two directions. For people with a college degree, marriage is still going【C6】______." However, Cherlin explains, "for people with less 【C7】______, there's less marriage and more breakups." Happy marriage【C8】______are much less common in such households. Another predictor of successful marriages is the quality of a【C9】______childhood relationship with their parents. "The kind of relationships you have with your parents【C10】______up are predictive of marital quality in【C11】______Umberson says. Finally, there is a chicken-and-egg【C12】______to successful marriages. "People who are married are【C13】______than people who aren't. The question is how much of this is【C14】______and how much is effect?" While natural selection【C15】______has an impact here, Cherlin says, "people who are【C16】______happy are more likely to get married, but marriage makes them even healthier." The【C17】______to good marriages is similar in Umberson's view. "I think it's the presence of emotional support, and that the person you're with does make you feel emotionally supported," she says.【C18】______, "If your partner is 【C19】______and demanding" all the time, those "are just red flags" in terms of marital happiness. And in terms of【C20】______, she notes, "marital strain is worse for your health than marital happiness is good for your health."