填空题 The family in Britain is changing. The once typical British family headed by two parents has {{U}} (36) {{/U}}substantial changes during the twentieth century. In particular there has been a rise in the number of single-person households, which{{U}} (37) {{/U}}from 18 to 29 percent of all households between 1971 and 2002. By the year 2020, it is{{U}} (38) {{/U}}that there will be more single people than{{U}} (39) {{/U}}people. Fifty years ago this would have been socially{{U}} (40) {{/U}}in Britain. In the past, people got married and stayed married.{{U}} (41) {{/U}}was very difficult, expensive and took a long time. Today, people's views on marriage are changing. Many{{U}} (42) {{/U}}, mostly in their twenties or thirties, live together without getting married. Only about 60% of these couples will{{U}} (43) {{/U}}get married. In the past, people married before they had children, but now about 40% of children in Britain are born to unmarried parents. In 2000;{{U}} (44) {{/U}}. Before 1960 this was very unusual. People are generally getting married at a later age now and many women do not want to have children immediately.{{U}} (45) {{/U}}. The number of single-parent families is increasing. This is mainly due to more marriages ending in divorce,{{U}} (46) {{/U}}.