1. They did / were doing their homework and then they went shopping.
2. ‘Where were you yesterday afternoon?’ ‘I visited / was visiting my grandparents!’
3. It rained / was raining when I left / was leaving home.
4. I saw Ben while I waited / was waiting for the bus.
5. I was waiting for the bus when I saw / was seeing Ben.

A. 1. did / 2. was visiting / 3. was raining / left / 4. was waiting / 5. saw

B. 1. did / 2. visited / 3. rained / left / 4. waited / 5. was seeing

C. 1. were doing / 2. visited / 3. was raining / was leaving / 4. waited / 5. saw

D. 1. were doing / 2. was visiting / 3. rained / was leaving / 4. was waiting / 5. was seeing