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Answer 1

3) They are our parents' friends.
    That is a room for children.
     It is my little sister's doll.
    This is Kate's dress.
4) seven - seventh
    fourteen - fourteenth
    twenty-eight - twenty-eighth
    thirty-eight - thirty-eighth
    fourty-nine - fourty-nineth
    fifty-two - fifty-second
    sixty-seven - sixty-seventh
    seventy-four - seventy-fourth
    eighty-one - eighty-first
    ninety-nine - ninety-nineth
    one hundred - one hundredth 
5. beds, women, triangles, cylinders, husbands, lines, pupils, feet, geese, copybooks