Marriage is still a popular institution in the United States, but divorce is becoming     1    as "popular". Most American people get married,     2    , at the present time, and fifty percent of American marriages end     3    divorce. However, four out of five divorced people do not     4    single. They get married a second time to     5    partners. Sociologists tell us that in the next century,     6    American people will marry, three     7    four times in one lifetime. Alvin Toffler, an American sociologist,     8    this new social form serial marriages. In his book Future Shock, Toffler gives many     9    for this change in American marriage. In modern society,     10    lives don't stay the same for very long. Americans     11    change their jobs, their homes, and their circles of     12    . So, the person who was a     13    husband or wife ten years ago is sometimes not as good ten years     14    . After some years of marriage, a husband and wife can     15    that their lives have become very different, and they don't     16    the same interests anymore. For this reason, Toffler says, people in the twenty first century will not     17    to many only one person for an     18    lifetime. They will plan to stay married to one person for perhaps five or ten years, and then many     19    . Most Americans will expect to have a "marriage carrier" that     20    three or four marriages.