The air here is fresh. There are not many tall buildings in our town. The best building is in our school. There are four hundred students and twenty-five teachers in our school. In the front of the school, there is a playground. I often play basketball with my classmates on it. There is a little garden behind our school. And we can grow beautiful flowers and plant trees in the garden. Next the garden, there is an orange orchard . You can hear birds singing everywhere. There is a river not far from our school. In summer, we usually go swimming in it. There is   _   in the front of our school.
a river a tall building a playground a garden