Past continuous vs Past simple

1.       When you ________ the door and saw the new TV, you felt surprised.

• was opening

• were opening

• opening

•        opened

      Last Monday, I _________ my bills and left.

• paying

• was paying

• paid   

• were paying

1.       I _________ when a plate crashed.

• cooking

• were cooking

• cooked

• was cooking

      We were running to the station exactly when the train _________

• left

• was leaving

• leaving

• were leaving

      From 6 to 6:15, I __________ pictures while I was having a walk.

• taking

• took

• was taking

• were taking

      Over last week, they __________ hard from Monday to Friday.

• was working

• were working

• worked

• working

      You __________ your teeth when, suddenly, she came into the bathroom.

• were brushing

• brushing

• brushed

• was brushing

       As they ___________ down the road, they found an owl.

• walked

• walking

• was walking

• were walking

      He didn't do his homework, he ___________ sleeping all night.

• was sleeping

• were sleeping

• sleeping

• slept

       At 9, Sean was reading while Samantha __________

• was shopping

• were shopping

• shopped

• hopping