Past simple 3 sentence past continuous 3 sentence

Past simple :
1. I baked a cake for 30 minuetes 
2. I ntered the office, looked around and came up to the secretary
3. I often went cycling last summer
Past Continious :
1. It happened while I was living in Bristol
2. At one o'clock she was having lunch
3. What were you doing yesterday at seven p.m.?