When & while_verb forms

She met her close friend while she ____ (travel) on a train.

While the woman was getting off the bus, she ___ (fall down).

The thief ___(break) into while we were sleeping.

John took a photo while I ____ (not/look).

While my mum was working in the garden, she ___(hurt) her back.

We were living in Madrid when our elder aunt ____ (die).

When I got up this morning, it ___ (rain) heavily.

While my dad was brushing teeth, my mum ____ (fall asleep).

I had a nightmare while I ____ (sleep) last night.

What happened then in your dream while a monster ____ (chase) you?