题目内容：
根据材料，回答问题。A couple of years ago, I went to a lady's house to buy some vitamins. Upon entering the house, I 11 that there was an electronic keyboard on a stand, leaning 12 the wall. Being a piano music lover and 13, I asked if the woman played. She nodded and added that she had been 14 lessons--at age 54!I told her that it was very 15 that she was pursuing (追求) her16to play the piano.
Then she asked me the same question.
"I have been playing for 8 years now," I answered.
"Then you must play a song for me before you leave," she requested.
I 17 she was kidding and I simply smiled. At the end of the18of the vitamins, she19 me of our musical "20". She then showed me to an old upright piano in the living room and asked me to play a song for her. I thought 21 and decided to play David Lanz's"Return to the Heart",since she had so much passion for 22 , and it was my soul-searching song.
I played the song to the best of my23, and with my emotions pouring into it as possible.She loved it. 24 I was about to step out of the door, I heard a weak voice calling out, "Young man!"
I turned around. And there was an old lady 25 one little step at a time with the help of another woman. "I wanted to come out to26 you for the beautiful song that you played. I have been very sick, and it's very hard for me to 27 my bed, but I really wanted to thank you for the song. It made me feel good ..." she said. With that, she turned around and walked 28 back to her room.
I was deeply touched by her 29 and felt a deeper understanding for the song. It served its purpose beautifully, returning to one's 30 for peace and joy.
A．observed
B．watched
C．noticed
D．caught
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