我再也不能如此粗心了(Wont Be So Careless Again)

　　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。