（英语完形填空）完形填空。

I used to live selfishly, I should admit. But one moment changed me.

I was on my lunch break and had    1  the office to get something to eat. On the way, I   2  a busker (街头艺人), with a hat in front of him. I had some   3   in my pocket, but I would not give them to him, thinking to myself he would   4  use the money to feed his addiction to drugs or alcohol. He   5  like that type-young and ragged.   6  what was I going to spend the money on? Only to feed my addiction to Coca-Cola or chocolate! I then   7  I had no right to place myself above   8  just because he was busking. I   9  and dropped all the coins into his   10  , and he smiled at me, I watched for a while. As   11  as it sounds, I expected something more to come from that moment-a feeling of   12  or satisfaction, for example. But nothing happened   13  , I walked off. “It proved to be a waste of   14  ,” I thought.

On my way home at the end of the   15  , I saw the busker again and he was   16  . I watched him pick up the hat and walk   17  a cafe counter. There he poured the   18  contents into a tin collecting   19  an earthquake fund-raising event. He was busking for charity!

Now I donate any   20  I have to charity tins and enjoy the feeling of giving.