1. The members of the club clean the school playground on||in||at Saturday mornings.
2. The students have to sit for the final exam in||on||at June.
3. Chu Van An Lower Secondary School is one of the most famous schools in||on||at Ha Noi.
4. The school canteen is on||in||at the second floor.
5. Which subjects do you like to study at||in||on school?
