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this morning i went to the classroom at seven o'clock because i was on duty today. of course i was the first one. i was cleaning the blackboard when li ming came into the classroom. i asked her, "who do you come here so early?" she answered with a smile, "i know you are on duty today. let me help you." i was very happy and said, "oh, thankyou. " we began to work together. when the teacher arrived, we had already done a good job, and the classroom was clean and tidy. the teacher praised me.

the day after tomorrow li ming will be on duty. i am going to help her too. we are good friends. we should help each other.