Choose the correct function of past continuous in the sentences

I was watching a movie yesterday when you called.

• A specific time in the past
• An action interrupted by another action
• Two actions happening at the same time

I was watching a movie yesterday while my friend was cooking dinner for us.

• A specific time in the past
• An action interrupted by another action
• Two actions happening at the same time

I was watching a movie yesterday at 8 p.m.

• A specific time in the past
• An action interrupted by another action
• Two actions happening at the same time

We were having a test while the teacher was watching us carefully.

• A specific time in the past
• An action interrupted by another action
• Two actions happening at the same time

We were having a test from 10 to 12 yesterday.

• A specific time in the past
• An action interrupted by another action
• Two actions happening at the same time

We were having a test when the headmaster came in.

• A specific time in the past
• An action interrupted by another action
• Two actions happening at the same time