阅读下面材料，在空白处填入一个适当的词（1个单词）或括号内单词的正确形式。

    My father ____( work) in an office. There ____ two large windows in it. One day, a woman in a ____(pass) car looks up and sees my father. My father waves his hands, ____ the woman waves back. This gives my father an idea.

  Later, he changes his way of ____ ( greet) people. He writes signs, like “Hello” ____ “Be happy”. Every afternoon when people go home from work, my father will greet them with the signs. Then they will give my father big smiles.

  The day when I come into the world, my father puts a sign ____ the window, “I’m a new father!” To his ____ (surprise), some of people hold a sign saying, “Congratulations!”

  My father learns the ____ ( true) in the saying, “You smile, and the whole world smiles with you.” And he becomes ____ first one who greets strangers with signs every day.

植物体内水分的运输依靠导管，无机盐的运输依靠筛管。

“民主是指政府是人民的，由人民统治的，为人民服务的。”这种说法抹杀了( )
①民主是一种国家制度，是在一定阶级范围内按照平等的原则和少数服从多数的原则共同管理国家事务的国家制度 ②民主具有鲜明的阶级性，任何民主都是一定阶级的民主和一定阶级的专政的统一体 ③资本主义国家对资产阶级的民主，只有社会主义国家才是对人民的民主，对少数敌对分子的专政 ④民主的全民性

下列对公有制主体地位的理解正确的是
①在全国各个行业，公有资产占优势 ②国有经济的比重增加 ③公有资产在社会总资产中占优势④国有经济控制国民经济命脉

下列各句中，划线的成语使用恰当的一项是（）