Fifteen years have passed since we graduated.I have found she has a few white hairs.few white hairs 为什么头发要用复数啊,她不是不可数吗?

I have been ()teapots for fifteen years I'm ------ ,and I have ------ sister.A.fifteen-year-old;a ten-year-old B.fifteen years old;a ten-years-oldC.fifteen years old;a ten-year-old D.fifteen year old;ten years old My parents __ for more than fifteen years.A,have got married B,have been married I have been a new reporter for the past fifteen years My parents __ for more than fifteen years.A,have married B,have got married C,have been married You are fifteen years old.I am fifteen years old,too.(同义句)____ ____ ____are fifteen years old. it‘s about fifteen years since they got married跟they have been married for about fifteen years两者有区别吗?可如果翻译的话......那不是跟后者不相同了吗? I am fifteen years old this__ are you ___ fifteen years old? He is_______old.A.fifteen B.fifteen year C.fifteen years D.fifteenthhng It fifteen years since I to schoolA.was,come B.is,came C.is,have come D.was,have comeIt后面和I后面有空 I have fifteen story-books.对fifteen提问 Amy is fifteen years old .Millie is fifteen years old同义句 Tom is fifteen years old.Mary is fifteen years old,too(改为同意句） 现在完成时的have been1.i have taught here for fifteen years.可以改成i have been teach here for fifteen years吗?可以改么?为什么?2. How long have you been away from your hometown.这个句子帮我分析下,虽然说how long和have be Tom studies at our school.He is a ________ boy.A.fifteen-year-old B.fifteen-years-old C.fifteen year old D.fifteen years old there——great changes in our town in the past fifteen years.A was、B were、C has been D have been fifteen-years-old的用法与区别fifteen year old ,fifteen years old,fifteen-year-old,fifteen-years-old,语法上分别有什么区别,分别怎么用,最好有例句