13%
Fill in the blanks in the detective's interrogation transcript to catch the suspect in a lie.
"So, Mr. Higgins, you claim you were peacefully feeding the pigeons _________________________ the bank alarm went off? But our security footage shows you running away with a bag of diamonds _________________________ the vault was breached!"
The correct answers are when and after.
Use when to introduce a specific event in the past simple that interrupts an ongoing background action in the past continuous ("were feeding... when the alarm went off").
Use after to show that an action (running away) logically followed a previous completed event (the vault being breached).