The ability to forgive others is a great thing that can certainly help to make life happier for everyone. However, some people think that it is very 1 to do, and they don't know how to forgive others, especially their family and friends. This is all 2 they don't understand the meaning of “forgiveness”.

    In the dictionary, “to forgive” means “to 3 feeling angry with somebody that has done something bad to you.” I'm happy that many people have 4 in doing this. I have succeeded, too, and I know how hard it is.

    I lived with a friend for two years. During that time, he did cause me many 5. I easily got angry when communicating with him. However, we 6 had a talk about our problems. When he pointed out that I wasn't treating him like a friend, I was 7. I never knew that I also needed to be forgiven for doing something wrong. I thought however 8 I might get, I did love my friend deep in my heart. Then I understood the saying, “To love is to forgive.” And when we 9 each other, we feel great. After that long talk, we both 10 those bad moments. Our friendship became fresh again.

    Now I understand the meaning of forgiveness better.

 小明来到实验室时，发现实验桌上有五瓶敞口放置的NaOH溶液，他想这五瓶NaOH溶液一定变质了。请你用方程式表示变质的原理：____ 。
其变质程度如何呢？
【提出猜想】小明猜想：这五瓶NaOH溶液可能全部变质了，也可能____ 。
通过查资料，小明知道：CaCl₂溶液和Na₂CO₃溶液发生复分解反应。
【实验探究】小明设计如下实验来验证自己的猜想，请根据表中内容填写表中有横线的格。

【拓展应用】保存NaOH溶液的方法是____ 。