Réponse:
Here is the story with the sentences rearranged to make it meaningful:
One day, our teacher made an important announcement. She said that our class would tour Akagera National Park. I was very excited to hear that.
On the day of the tour, I woke up very early. I was among the first to arrive in school. We left in a big bus at eight o'clock.
At the park, we saw animals like buffaloes and elephants.
At the end of the day, we were very tired. We were also very happy.