Singular because it ends in on which makes it singular like always
1. La escuela
2. La cafeteria
3. El gimnacio
4. habitación/ recamara/ cuarto
Answer:
Idk if your asking for help with the sentences but here's what the words mean
1. Trabajar: To Work
2. Estar: To be
I hoped this helped but if it didn't whatever your sentence is you wanna use type it into google translate!!!!!!!!!!!!!!!!!
Explanation:
Is that a language yes or no