I (worked/had worked) part-time in that store when I was at univerisity
worked
I suddenly remembered where I (saw/had seen) him before
had seen
He (was/had been) arrested at the airport late last night
was
She lost her job after her boss learnt she (lied/had lied) to him about why she needed time off
had lied
The gang broke into the house and (had demanded/demanded) money
demanded
My wife rang/had rung the emergency services while I was helping the victims
rang
By the time I realised what (happened/had happened), it was too late
had happened
I noticed that my neighbour (was leaving/had left) his front door open
had left
