阅读下面短文，从短文后各题所给四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。
I wrote my first note to my mother and it said, "Hi, Mom! Have a nice day! 1, Marie!" I was twelve when I wrote it, and I 2 the note into her change purse (零钱包). My mother worked 3 a cleaner in a clothing factory. I knew that when she bought meals in the dining hall, she had to 4 changes in her purse. I didn't know that she always kept that note, and carried 5 with her.
After that, I 6 folded the small piece of paper into my mother's change purse, she and I left each other secret notes. My mother usually hid her notes in the fridge, under a lamp 7 beside the TV set. I even found one hidden in my shoe. Gradually, I understood 8 notes became the records of our days, ideas and wishes. But to my mother and me, they were a life-long communication with each other that 9 else shared.
On October 20, 2018, my mother 10 after an illness. I stood near her bed, holding her hand. I didn't cry on that day when my mom passed away (去世). A week 11, I even didn't cry. I was so thankful 12 she no longer had aches and pains.
Recently, I13a note that my mom left me. It was hidden in the pages of my favorite childhood book for years. It14"Dear Marie, I love you always. Miss you a lot. Don't forget me. Be15! Love, Mom" That day, I cried.
