完形填空One summer day, with a heavy heart a

     One summer day, with a heavy heart and four dollars in my pocket, I was   1  my way to get some milk
and bread. In those days, I was a   2  visitor to the supermarket because there never seemed to be   3  
money for a whole week’s food-shopping   4  , because the part-time job that I did could hardly   5  
enough money for me to feed the children after my wife’s death.
     As I came to a red traffic light, I   6  a couple and a child by the roadside. The hot noonday sun beat
down on them    7   mercy (怜悯). The man held up a sign which   8  , “Work for Food.” The woman just
stared at the cars waiting at the red light while the child sat on the grass   9   a one-armed doll. I wanted so much to   10   them some money, but if I   11   that, there wouldn’t be enough left to buy the milk and
bread. Four dollars will only go so far. As the   12   changed, I took one last glance at the three of them
and sped off feeling both guilty (内疚的) and   13  .
      As I kept driving, I couldn’t get the   14  of them out of my mind. I even could not   15   it any more.
Finally, I turned around and drove back where I had   16   seen them. I stopped my car and handed the
man two of my four dollars.   17    he thanked me, I saw tears welling up his eyes. I  18  back and drove
on to the supermarket. Perhaps milk and bread would be  19 , I thought. What if I only got milk alone,
   20   just the bread? Well, I would have to do so.