past progressive vs simple past

I was taking a shower ____ the electricity went off

• while

• when

• so

My parents ___ checking a document when I called them up

• was

• were

• are

My mom was cleaning the house ___ I had classes

• while

• when

• or

I was sleeping when ___

• somebody rang the bell

• somebody was ringing the bell

• the bell was ringing

Last weekend, I ____

• do nothing

• was doing nothing

• did nothing

My brother ___ when I saw him

• was driving

• drove

• is driving

I ____ while I listened to music

• was reading

• read

• am reading

I was watching YouTube while

• I was having lunch

• I had lunch

• both

• neither

I___ Math last night at 7 pm.

• studied

• study

• was studying

My dad ___ to pay the electric bill yesterday

• was forgetting

• forgot

• forgets