Final answer:
In the context of office safety, windows should be kept closed and locked for security when not in use, but can be opened for ventilation or light during office hours depending on the needs. The activity given by the teacher is likely to help understand the functional value of windows and doors in a controlled environment.
Step-by-step explanation:
In an effort to stay safe in the office, windows should ideally be left closed and locked when not in use, especially if the area is unattended. This ensures that nothing undesirable enters, and it provides a level of security. However, the context of usage also matters. If the priority is ventilation or letting in light, then having them open during office hours can contribute positively to the work environment. It's important to control what enters and leaves an office, much like a house with windows and doors that can be both opened and closed.
In the activity described by your teacher, closing all the windows and doors seems to be a part of an exercise perhaps to understand the role and function of these in ventilation, emergency safety practices, or another specific learning goal.
Ultimately, the state of windows—whether open, closed, locked, or covered with curtains—varies based on the current needs, such as safety, privacy, or light requirements. Following the teacher's instructions for the activity will help in understanding their importance in a controlled environment.