Okay, let's complete the sentences using either the past simple or past continuous tense.
1. **We were having dinner when you called last night.** (Past continuous is used to describe an action that was in progress when another action happened.)
2. **It wasn't very cold yesterday.** (Past simple of 'not be'.)
3. **Did Ben buy any new clothes in town?** (Past simple, question form.)
4. **Dan dropped his phone while he was making a call.** (Past simple for 'dropped', past continuous for the ongoing action 'was making'.)
5. **What were you doing at 7.30 last night?** (Past continuous, question form.)