为测定空气中氧气的含量，某兴趣小组的同学选用了40mL的试管作反应容器（如图）和量程体积足够大且润滑效果很好的针筒注射器，将足量的白磷放入试管后，用橡皮塞塞紧试管，并夹紧弹簧夹．用酒精灯加热白磷，燃烧结束后，等到试管冷却后松开弹簧夹，观察现象．

在未装满水的玻璃瓶瓶口上，塞上插有细玻璃管的橡皮塞，向管内吹入少许气体后，管内液面上升，如图所示，这样就制作成了一个简易的（　　）

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.