Com relação ao uso de singular e plural das frases abaixo, podemos dizer que:

1. Electronics is on sale at the department store next to my office this week.
2. Petrobras have finally released a note about the new offshore Project.
3. A hundred thousand dollars was used to rebuild the auditorium destroyed by a tornado in 2021.
4. Gymnastics is becoming my school’s favorite sport. Everyone wants to be in the team.