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阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。

I woke up early the other day. When I was washing my face, I received a(n)  1  from a taxi driver who had my friend’s mobile phone. It was easy to  2  that my friend had left it in the  3   the night before. The driver had called others, but I was the first one to  4  . The driver asked me where he could  5  the phone off. I told him the street where I  6  . Then I quickly jumped out of bed, and got dressed to  7  him on the corner of the street. The driver drove all the way from Queens to  8  this phone. I believed if he had taken on a passenger or two, he could have made some good  9  from driving that distance.

   When I met up with the driver, I thanked him for making an effort to find the  10  . I was so happy for my friend because of this man’s  11  . My friend recently moved to New York from abroad and I could imagine how  12  the phone was. I further asked the driver if I could get his   13  so that my friend could  14  him as well. He said my thankfulness was all that he  15  and drove off.

    I emailed my friend and told him I had his phone. Later that day, I met him and described how I had  16  it. My friend said he couldn’t believe such kindness should   17  in this big city. He told me he could not  18  to pay it forward.