题目内容

根据短文内容填空。
     My grandfather is already sixty years old. But he has only fifteen birthdays. Do you know why?
When is his birthday?
    Keys: His birthday is on February 29th. It's a leap(闰年)year every four years. So he has only
fifteen birthdays.
1.An interesting______.
2.  My grandfather is______years old.
3.  He has only______birthdays.
4.  His birthday is on______
5.  A leap year happens(发生)every ______ years.
1. birthday  2. sixty  3. fifteen  4. February 29th   5. four
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