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There are twelve months in a year. Each month has thirty or thirty-one days, except(除了) February. In a leap year, February has twenty-nine days. a leap year comes once in four years(四年一次). There are 365 days in a year. The parts(部分) of the days are: morning, afternoon, evening and night. April, June, September and November have thirty days. January, March, May, July, August October and December have thirty-one days. There are also some holidays in a year. New Year's Day is January 1st, Children's Day is June 1st, Teachers' Day is September 10th. I like Children's Day very much. What about you?