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    Sally Smith is a teacher in a middle school. She goes to school at seven thirty. Her classes are from 8:00 to 8:40. All the students like her Chinese classes a lot.

    But in March, the students are always sleepy in class. They don't listen to her in class. Sally Smith is not happy about this. "How can I make my classes more(更加) interesting?" she thinks.

    Then she has a good idea(主意). She comes to the classroom, and then. she starts to tell her students some interesting riddles(谜语). All the students like the riddles. They are very happy in class. They like Sally's classes again.