Past Simple or Past Perfect?

When I __________ (open) the door, my mother had arrived.

• open

• opened

• had opened

Jose had already turned the lights when I __________ (enter) the class.

• entered

• enter

• had entered

We _______________ (make) many tests when the quarantine started.

• made

• maked

• had made

He __________ (take) my plate before I had finished.

• taked

• took

• had taken

I asked the teacher because I __________ (not hear) the question.

• didn't hear

• didn't heard

• hadn’t heard

I had checked the traffic light when I __________ (cross) the street.

• crossed

• had crossed

• cross

She __________ (buy) the ingredients before she made the cake.

• bought

• had bouhtg

• had bought

When I __________ (get) to the airport I discovered I had forgotten my passport.

• get

• got

• had got

When we __________ (arrive) at the station, the train had already left.

• arriven

• arrived

• had arrived

It __________ (not rain) during the morning, so we left home.

• didn't rain

• hadn't rain

• hadn't rained