Final answer:
The word missing in Q1 is 'lawful'. Police officers are required to obey all lawful orders given by a superior officer.
Step-by-step explanation:
The word missing in Q1 is lawful.
In the given statement, it is stated that police officers shall obey all lawful orders given by a superior officer. This means that officers are required to follow orders that are in accordance with the law.
For example, if a superior officer instructs a police officer to arrest a suspect who is engaging in criminal activity, the officer should obey this order as it is lawful. However, if a superior officer gives an order that is unlawful, the officer has the responsibility to respectfully inform the superior officer and seek clarification.