题目内容：
ThefamilyinBritainischanging.TheoncetypicalBritishfamilyheadedbytwoparentshasundergone（26）changesduringthetwentiethcentury.
Inparticulartherehasbeenariseinthenumberofsingle-personhouseholds,which（27）from18to29percentofallhouseholdsbetween1971and2002.Bytheyear2020,itis（28）thattherewillbemoresinglepeoplethanmarriedpeople.Fiftyyearsagothiswouldhavebeensocially（29）inBritain.
Inthepast,peoplegotmarriedandstayedmarried.Divorcewasverydif-ficult,expensiveandtookalongtime.Today,people's（30）onmarriagearechanging.Manycouples,mostlyintheirtwentiesorthirties,livetogetherwithoutgettingmarried.Onlyabout60%ofthesecoupleswill（31）getmarried.
Inthepast,peoplemarriedbeforetheyhadchildren,butnowabout40%ofchildreninBritain（32）unmarriedparents.In2000,aroundaquarterofunmarriedpeoplebetweentheagesof16and59werelivingtogetherinGreatBritain.Before1960thiswasvery（33）.Peoplearegenerallygettingmarriedatalateragenowandmanywomendonotwanttohavechildrenimmediately.Theypreferto（34）theirjobsandputoffhav-ingbabiesuntiltheirlatethirties.Thenumberofsingle-parentfamiliesisincreasing.Thisismainlyduetomoremarriages（35）divorce,butsomewomenarealsochoosingtohavechildrenasasingleparentwithoutbeingmarried.
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