Réponse :
1.
blood stains: 4
Fingerprints: 1
Footprints: 3
Magnifying glasses: 2
2.
Clue: Indice
Evidence: preuve
Investigate: enquêter
Solve a mystery: résoudre un mystère
3.
Murderer: a person who kill somebody...
Victim: A person who was attacked...
Suspect: a person who is suspected...
Witness: a person who sees something...
detective: A person who gathers information....