{"parts":[["choose","Choose the correct answer.","0","","",[["This is ___ book.",["John","Johns","John's","Johns'"],0],["That is ___ car.",["Mary\u2019s","Marys'","Mary","Marys"],1],["The ___ toys are scattered all over the floor.",["childrens","children","childrens\u2019","children\u2019s"],2]]]],"corr":[[3],[1],[4]],"exp":["","",""]}
10
