Simple past vs Be+ing Past

I was walking my dog when it ....... to rain.

I was doing the last exercise when the school bell .......... .

Why ....... me yesterday?

She ........ Grey's Anatomy in her bedroom when someone broke into her house.

When the teacher entered the classroom, the students ......

My brother ........... the trumpet when it started to rain.

The children were dancing when the teacher ........... the classroom.

What ...... yesterday at 8 pm?

When Karen ...... , Mike was sleeping.

She ....... on the table when she fell.

We ................... football when the bell rang.

What ..................... when the rain started?

When I came home, mom _________________ a meal.

While she was talking on the phone, ...

When the accident [[1]], she [[2]] on the pĥone with her brother.

Yesterday evening we [[1]] a horror film when the storm [[2]].

The zombies [[1]] the city when someone [[2]] the door.

The T-Rex [[1]] while they [[2]] in the jungle.

When I saw Jennifer, she ......... (go) to school

It ......... (begin) to rain while she was singing.

She met her favourite star while she ......... (visit) Los Angeles.

He was walking in the street when he ......... (see) Ariana Grande.

When my mum ......... (enter), my sister was crying.

He ...... (phone) while we were having dinner.