阅读下面材料,在空白处填入恰当的内容(1个单词)或括号内单词的正确形式。
Were you the first or the last child in your family? Or were you a middle or an only child? Some people think___matters where you were born in your family. But there are different ideas about   what birth order means. Some people say that oldest children, __are smart and strong-willed, are very likely____(succeed). The reason     _this is simple. Parents have a lot of time for their first child and give him or her a lot of attention. An only child will succeed for_   same reason.
What happens to the  _ children in the family? Middle children don’t get so much attention, so they don’t feel that important. If a family has many children, the middle one sometimes gets lost in the crowd. The youngest child, __ , often gets special treatment. Often this child grows up to be funny. But a recent study saw things quite   _(difference). The study found that first children believed in family rules. They didn’t take many chances in___lives. They usually    _(follow) orders. Rules didn’t mean as much to later children in the family. They took chances and they often did better in life.