It was lack of money, not of effort, ___...

It’s more than half a century _____ my grandfather joined the Party and became a servant to the people.

Was it at five o’clock ______the fire broke out？

It was just in the room _____ he was born _____ he died.

It was the boy _____ had been in prison _____ stole the money.

It was his nervousness in the interview ______ probably lost him the job.