It was a very foggy day in London.The fog was so thick that it was impossible 1 more than a foot（英尺） or so.Buses, cars and taxis were not able to run and were 2 by the side of the road. People were trying to find their way on foot but were losing their way in the3 .
Mr.Smith had a very important meeting at the House of Commons（下议院） and had to get there on time.He 4 to walk there but got lost.Suddenly he bumped （撞） into a stranger.Mr.Smith apologized and told the stranger that he wanted to get to the Houses of Parliament（国会大厦）.The stranger said he would 5 him there.Mr.Smith thanked him and they started to walk there.The fog was getting 6 every minute but the stranger had no trouble finding the way.He went along one street, turned into another, crossed a square and at last they 7 the Houses of Parliament after about half an hour's walk.
Mr.Smith was very 8 .He didn't understand how the stranger could find the way so 9 ."It is wonderful, "he said. "How do you find the way in this fog？""It is not a 10 for me, "said the stranger."I am blind. "
Sometimes your biggest weakness can become your biggest strength.
