Past Perfect vs Past Simple 4º ESO

Complete the second sentence so that it has the same meaning as the first two sentences. Use the past perfect and the past simple.

I took an aspirin. Then I felt better.
When I had taken an aspirin, I felt better.

1 She did her homework. Then she went to bed.
When ……….............................................….. .
2 We saw our friends. Then we went home.
When ………....................................……….. .
3 He rang his parents. Then he felt happy.
When ………..................................……….. .
4 I went to London. Then I visited Oxford.
When ……….....................................……….. .
5 They took some photos. Then they left.
When ……….......................................…….. .