阅读下面的短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
On June 25, two days after our kidney transplant （移植） surgeries, my daughter-in-law, supported by her nurse and my son, walked into my hospital room in Seattle． There she was, the   36   of my kidney, smiling at the foot of my beD．That's when I realized the full    37    of "to give is to receive．"
This February,   38   her kidney function continued to decline, my daughter-in-law needed a kidney transplant to   39 ．I told her that it would be a（n）   40   to me to be able to donate a kidney to her． Immediately I was found compatible （相匹配的）, my   41   as a kidney provider began． After  42   some tests and exams with my personal physician, I flew to Seattle for   43   testing． Whenever I "passed" one   44 , I became more relieved．Then I received the phone call telling me I was   45 ． which made me very happy．   46 , the day arriveD．Before the surgery, I truly wasn't afraid; I just wanted the transplant to be 47 ．
I woke that evening, my son telling me that my left kidney was   48   in my daughter-in-law． A strong sense of   49   washed over me． It was one of the most _50   moments of my life．
A   51   later, I got an e-mail from my daughter-in-law, saying: "Happy One-Month Anniversary!" We did have something to   52     I wasn't affected much by the surgery, and more importantly, she felt like she had her   53   back．
Up to now, being able to see my daughter-in-law   54   one of my kidneys has been one of the greatest gifts I have   55   received．

A．provider B．receiver C．operator D．doctor

A．plan B．concept C．meaning D．advantage

A．as B．if C．though D．Unless

A．leave B．survive C．rise D．pass

A．attempt B．comfort C．experience D．gift

A．challenge B．surgery C．journey D．action

A．completing B．marking C．failing D．writing

A．still less B．even more C．much worse D．far better

A．difficulty B．problem C．stage D．test

A．refused B．cured C．approved D．charged

A．Gradually B．Finally C．Immediately D．Suddenly

A．safe B．special C．comfortable D．secret

A．behaving badly B．staying safe C．going wrong D．working well

A．guilty B．sacrifice C．relief D．appreciation

A．satisfying B．worrying C．frightening D．surprising

A．year B．week C．moment D．month

A．remember B．share C．celebrate D．treasure

A．beauty B．smile C．confidence D．life

A．benefit from B．contribute to C．care for D．focus on

A．never B．ever C．already D．almost