His mother died of cancer, and his weak father had to __4__ 11­year­old David to the care of the state.

　　Things seemed always to go from bad to

　　__5__.

　　Two years ago, his beloved guide dog pulled him out of the __6__ of a truck. David was not hurt. The dog __7__.

　　But David does not feel sorry for himself. “These are just little obstacles(障碍)you have to __8__ in your life，” he said.

　　He has to make a daily two­hour trip to his working place—the X­ray department of an

　　__9__

　　room.

　　It was a hard job to

　　__10__. Before he got it, David was determined to escape the workshop run by the Lighthouse, an organization __11__

　　to help blind people. He wanted a job of developing X­ray film, something

　　__12__， not just he, must do in the dark, including people with __13__

　　eyesight. The Lighthouse called many hospitals, with no result,

　　__14__ they offered to pay his first three months' salary.

　　David works alone in a dark room that

　　__15__

　　of chemicals. He cannot wear gloves.

　　__16__， he could not feel. Since this is an emergency room, lives can be put

　　__17__

　　or out of danger. His directress says she trusts him 100 percent.

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