—I sleep five hours a night.

    When Mary Smith was a 1, she wanted to be a teacher. 2 she liked children.

    When she was twenty, she began teaching in a small school. She was a good teacher, and she 3 a lot with the children in her class. They 4 her teaching.

    One day 5 of the girls in her class said to her, "Miss Smith, 6 does a man's hair become grey before his beard（胡子）does?

    Mary laughed and answered, "I don't know. Helen, do you know?"

     "I don't know either, Miss Smith," said Helen. "But it happened to my father." The 7 children in the class laughed when they heard this.

    Then a boy said, "I 8 , Miss Smith! A man's hair becomes grey 9 because it's sixteen years10 than his beard."