Here are the reordered sentences:

1. She is studying quietly in the library.
__________________________________________________________________
2. They will prepare the presentation in the conference room after lunch.
__________________________________________________________________
3. My parents are taking me to an exciting restaurant for her birthday next week.
__________________________________________________________________
4. We are working together on a project on environmental issues at the community center.
__________________________________________________________________
5. The marathon is being held in the city at the central park next month.
__________________________________________________________________
6. The team will be playing the final match at the stadium next Sunday.
__________________________________________________________________