阅读理解。阅读短文，根据所提供的信息判断句子正误。

    Yesterday was September 10th. It was Teachers' Day. We bought some flowers and presents to our teachers' office. We thanked them for their hard work. Our teachers were very happy. In the afternoon we held a party in our school hall. Many students and teachers gave wonderful performances at the party. Our teachers sang and danced happily with us. All the teachers and students had a good time.