Ответ:

 She washed up and fed the dog an hour ago. (action sequence in the past)

3 Mrs Smith was knitting and Mr Smith was watching TV last night. (simultaneous actions)

4 They were sunbathing when it started to rain. (interrupted action)

5 Gustav Eiffel built the Eiffel Tower. (He is no longer alive)

6 they had a party last night. (completed action)