1. 
   The students ___________ a difficult exam when the fire alarm went off.

Look at those workers! They ___________ tirelessly since morning.

What ___________ your brother ___________ at this time last night?

She ___________ for her keys everywhere yesterday until she found them in her bag..

While I ___________ TV, the phone suddenly rang.

The construction workers ___________ the foundation when the rain began.

Last week, my grandmother ___________ her old photographs and reminiscing about her youth.

1. 
   We ___________ to the concert when we realized we forgot the tickets at home.

When I entered the room, she ___________ on the phone with her best friend.

My parents ___________ a movie at the cinema while I was at home studying.

While we ___________ the cake, the power went out.

At this time last year, we ___________ in Paris, enjoying the beautiful sights.

While I ___________ a book, I heard a loud noise outside.

1. 
   The children ___________ happily in the garden when it started to rain.