隐性性状是指不表现出来的性状．（判断对错）

根据短文内容，用方框中所给单词的适当形式填空，并将答案写在相应的横线上。每词限用一次。

    One day, Alex, I and a group of other children had a game of football on ____way to school. One of the older ____ pushed me and I fell over and tore (扯破) my jeans that I had to ____ home to change. I arrived very late for school that day. I thought I'd get into trouble about it, but nothing ____. After class, the teacher talked about it with me and told me to be ____ in the future. I asked how he knew about it. He said, "Alex told me what had happened." That afternoon I walked home with Alex and thanked him. I knew he was a true friend. 

下列实验能验证质量守恒定律的是（  ）