Bonjour,
Réponse :
1. Patricia Higgins was killed by her enemy.
2. 2,000,000 copies of Crime on My Mind were sold by Arthur Croydon.
3. DNA traces were found by crime scene analysts.
4. Jim Johnson was declared public enemy by the FBI.
Explications :
Passif :
Sujet + Be ( conjugué ) + participe passé + by + complément d'agent
( celui qui subit l'action ) ( celui qui fait l'action )