完形填空（共20小题；每小题1分，满分20分）
阅读下面短文，掌握其大意，然后从36～55各题所给的四个选项（A、B、C和D）中，选出最佳选项。
Albert Einstein said, “In the middle of every difficulty lies opportunity.” Once  36  , such opportunities are like valuable diamonds hidden in the sand.
Several years ago, I spoke at a school about how we were surrounded by “__37  ” if we could only recognize them. A man stopped by to see me, and I  38   him as somebody who had suffered through a(n)  39  divorce (离婚) and was examining what was most important to him. He took a small  40  out of his pocket. Here is what he said to me that day.
“I  41  on this stone when I was leaving church last Sunday. You had spoken about  42  opportunities—diamonds. I put the stone in my  43  to remind me to look for those diamonds that I need. I have been trying to sell my  44  . On Monday morning, a man who seemed interested in  45  some of my stock (股票) stopped by. I thought, ‘Here’s my diamond—don’t let it  46  !’ I sold the entire stock to him by noon. Now my next diamond is to find a new 47  !”
Not long afterward, he did find a new and better job. From then on, he  48  to keep his stone with him all the time as a   49  to look for “diamonds” as he digs through the  50  of life.
Richard DeVos is right when he  51  . “This is an exciting world. It is filled with opportunities.  52  moments wait around every corner.” Those moments are diamonds that,   53  left unrecognized, will be forever lost.
Are you looking for “diamonds” every day? If not, you may  54  pass them by! Perhaps there is a diamond of opportunity hidden in the difficulty you’re  55  now.
36.A.given                           B.discovered                      C.sent                         D.made
37.A.opportunities           B.dangers                           C.diamonds               D.chances
38.A.considered                B.treated                                      C.remembered                  D.saw
39.A.painful                        B.stupid                               C.normal                    D.original
40.A.ball                              B.stone                                C.paper                      D.flower
41.A.stepped                     B.depended                        C.fought                     D.based
42.A.stealing                      B.accepting                        C.recognizing            D.realizing
43.A.purse                          B.pocket                              C.bag                          D.house
44.A.stone                          B.position                            C.career                     D.business
45.A.selling                         B.buying                              C.hunting                            D.casting
46.A.go off                          B.give in                               C.stay up                  D.watch out
47.A.buyer              B.job                 C.stock          D.rock
48.A.hoped             B.decided              C.refused         D.hated
49.A.scene                          B.prize                                 C.reminder                D.power
50.A.difficulties                 B.hopes                               C.characters             D.cases
51.A.takes over                 B.leaves out                             C.points out              D.calls for
52.A.Actural                       B.Great                                C.Dangerous             D.Necessary
53.A.unless                         B.though                             C.for                            D.if
54.A.happily                       B.easily                                C.luckily                      D.dangerously
55.A.expressing                B.satisfying                         C.breaking                 D.experiencing