阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

    My mom is very important to me. She was 40 years old ____ I was born. She takes good care of me.

    She did so many things for me ____ my elementary school years. When I was a child, she liked to prepare the ____ (delicious) food for each dinner everyday.

    ____, my mom was the one who often beat me. I always cried ____ (loud) to let the neighbours think she ____ (kill) me. For example, if she acted as though she was about to raise her hand to me, I would often open my ____ and let the world know about it. ____ anybody was passing by out on the road, she would either change her mind ____ just give me a few light touches. So early in life, I had learned that if you want something, you ____ make some noises.

用化学方程式解释下列有关问题

依次填入下列句子空缺处的词语，最恰当的一项是（  ）
①人类的祖先在迁徙过程中    了漫长的岁月。
②人类固然不希求逢到哀苦，然而为了   人生的美好，也不应该躲避痛苦。
③老师的声音很平和，却带有一种不容   的断然压力。
④在       的林海深处，也许生长着一些不为人类所知的稀有物种。

____×____=____(棵)。

答：一共有____棵小树。