1. Choose the correct word in italies by underlining it. 1. All follow-up investigations must/should be carried out by criminal investigations. 2. The officer in charge must/should be steady polite and consistent while taking over the control of the crime scene. 3. A record must/should be kept of the people who enter or leave the crime scene. 4. A wider security perimeter must/should be sealed off the crime scene with only one entry point. 5. The officers in charge must/should look for potential witnesses or take care of those already identified. 6. The head of investigation must/should find out any change to the crime scene original condition. 7. The head of investigation mustn "t/shouldn't give any hasty explanation of the case. 8. The police must/should record all physical evidence at the crime scene.