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XI. Possible versions

Basic version(基础版):

      Today is Saturday and I am left at home alone.When I am watching TV, I hear a loud knock at thedoor. Who is it? It can't be my parents because theyare on a business trip in Hong Kong. It can't be athief. He is afraid to be found and it is impossible forhim to knock at the door. Then it may be myneighbour. He is at home and may need my helr