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One day I went out and left my key in the house。 When I came back， I found I couldn＇t get in without my key。 What should I do? After a moment， I got an idea。 I picked up a big stone and was ready to break the window。 Suddenly there came a deep voice， "What are you doing?" I turned over and saw a policeman was behind me。 It took me quite a long time to explain myself。 I won＇t be so careless again。