阅读理解。
The old man is already sixty years old. But he has only fifteen birthdays. How is it? 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.
根据短文内容填空:
1. The old man is _______ years old.
2. He has only ________ birthdays.
3. His birthday is on _______.
4. A leap year happens(发生) every _______ years.
