Question

change the voice ' The boy took it the police station and when the police officer opened the suspicious suitcase it exploded . The kid survived but the othe police were killed by the bomb.

Answer 1

It was taken to the police station by the boy, and when the suspicious suitcase was opened, it exploded. The kid survived but the other police were killed by the bomb.

‘exploded’ and ‘survived’ are intransitive verbs, so the clause they appear in cannot be converted into passive voice.

Also, the last clause, which is a subordinate clause (but the other police were killed by the bomb), is already in passive voice.