根据短文内容，选择最佳答案。

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How time flies! It's time to say goodbye!

Thank you, my dear friends. We rally changed a lot in six years. Before, we were short and small. Now, we are tall and big. We studied and played together. We learned about robots in the science club. We had lots of fun.

Thank you, my friendly teachers. Sometimes you were strict, but our class were full of fun. We had different parties in spring. We visited the Great Wall and the nature park in autumn. They were all interesting.

Thank you, my lovely school. We learned and enjoyed every day. We painted in the art room. We read books in the library. We jumped and ran on the playground. It was happy to study here.

In the past six years, we had so many special memories （回忆）.