1. (2022高二上·泸县月考) 阅读下面短文，从短文后各题所给的 A、B、C 和 D 四个选项中，选出可以填入空白处的最佳选项。

All of us have co-workers who have trouble being kind. They can be1to deal with and can make work a nightmare. But do we know why they are like this? Do we know the2behind their actions?

I have a co-worker who has done all she can to make it hard for those3around her. We had a particularly hard week and there was a sales4of our products because we were in the low season.

What's worse, our sale promotion plan was5. So she was taking it out on the rest of us. At the6, I was mad and hurt and was letting her bring me down. Then I stopped and7myself. Do I know why she is8this way? Do I know what goes on behind closed doors or why she does the things she does? 

I9my mother once told me that the best way to feel better when you were treated badly is to be kind towards others — especially the one who10you. When she went on a lunch break, I went to the shops and11her a box of chocolates and put an anonymous note with some12words on top along with a smile card.

After she came back from lunch, she opened her13and read the card. She looked around and re-read it again. She then14placed it in her drawer. What made me more15is that she was very calm for the rest of the day and that I often saw her look into her drawer as if to find16that someone cares.

At the end of the day, I went and said17to her and noticed that the smile card had been18on her noticeboard. She suddenly stood up and19for what she had done. But I just smiled, wished her a20night, and walked away.