When and While

While Dad was working on the computer, my brother (a)   ( do ) his Maths homework.

When the class (a)   ( begin), Jim was drawing a picture.

While Mr. Black (a)   (swim) in the lake, Tom and Tania were eating hamburgers.

Tim and Ryan (a)   (talk) to each other when Rihanna arrived.

While miss Jen (a)   (show) a film, Mark was sleeping.

While I was talking on my mobile phone, my brother (a)   (try) on my new pullover.

While Anita (a)   (cook) spaghetti, Nia and Thomas were discussing an issue.

When the bell (a)   (ring), we were playing badminton.

I was having an exercise when my sister (a)   (fall) off her bike.

While Mr. Drake was explaining, the students (a)   (write) an essay.