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from March 25th to January 1st in the mid1560’ s by King Charles IX, there were some people who still celebrated it on April 1st because they had got used to this and those people were called April Fools. ( Grammar Focus4c) On April Fool’ s Day, people play jokes on others. Setting a roommate’ s alarm clock back an hour is a mon joke. Whatever the joke is, people usually end it by saying“ April Fool!” April Fool’ s Day is for fun only. Nobody is expected to buy gifts for friends. Nobody gets off work or school. ( Grammar Focus4c) It’ s simply a fun holiday. But it’ s a holiday on which one must remain vigilant(警惕的 )forever, for he or she may show up at any time anywhere to play jokes on you, maybe in your office or in the market and so on. ( Grammar Focus4c) Each coun