Past Progressive with Simultaneous and Interrupted Actions

While I _____ (cook), my friend _____ (sing) in the living room.

• was cooking, was singing

• was cooking, sang

While I _____ (to be, play) on my PC, my brother _____ (to be, play) on his PlayStation.

As I was reading the book, the phone _____ (ring)

The children _____ (to be, build) sandcastles, when a wave _____ (wash) them away!

• were building, washed

• was building, wash

While we _____ (to be, watch) TV, the neighbours had a loud party.

She _____ (to be, cycle) to work when it _____ (start) raining.

• was cycling, started

• were cycling, start

I _____ (to be, study) for the exam, while my friend was listening to music.

Why _____ (to be, the children, cry) when I came?

What _____ (to be, you, do) when the fire alarm went off?

What _____ (to be, the students, do) when the teacher was explaining a new concept?