On Thursday, we went back to school. We could go to school later than before. The students that came to school early didn't do excercise in the classroom. The others did exercise in the classroom. Our teacher wanted us to be hard-working. When we were talking at the lunchtime, our teacher came into the classroom and said:"Don't chat at lunchtime." We had an exam in the afternoon. It was quite hard. The next day, our teacher said:"You must do the homework," to some students that didn't do the homework. We had PE class on Friday, so I was happy. On Saturday, it rained when we were studying.
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Good job. Just a couple small corrections.