从所给的四个选项中选择最佳答案

My sister ______ books in a bookshop．

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A．sell　　　B．sells　　　C．selling　　　D．to sell

Mary’s dime（一毛钱）
It was Sunday afternoon. I decided to clean up the room nicely so that my parents would feel   1  when they returned from a long ride! Then, I sat in the room, having nothing to do.
　　 What else could I do? Then, with no reason, I suddenly  2  the pale face of that little beggar(乞丐) girl. I could see the glad light   3  her eyes when I put the dime in her little dirty hand.
　　  How much I  4  that dime, too! Grandpa gave it to me a whole month ago, and I had kept it ever since in my red box upstairs, but those sugar apples looked so attractive, and were so   5  — only a dime a piece — that I wanted to have one.
　　  I could imagine the little girl stood there in front of the  6  in her old dirty dress, looking at the   7  that were put all in a row in the window. I wonder what I should say, “Little girl, what do you want?” I gently asked. She felt   8  and looked straight at me, just as if（似乎）nobody had spoken so   9  to her before. She realized what I had meant, so she said seriously and sadly. “I was thinking how good one of those delicious hamburgers would  10 . I haven’t had anything to eat today.”
　　 Now I thought to myself, “Mary Williams, you have had a good breakfast and a good lunch today,   11  this poor girl has not had a mouthful yet. You can give her your  12 . She needs it a great deal more than you do.”
　　 I could not run away from that little girl’s sad,  13  look — so I dropped the dime right into her hand. How  14  the girl was! I am so glad I gave her the dime,  15  I had to go without the apple lying there in the window.