1. After they had seen (see) the Tower, they went (go) to Westminster Abbey.
2. He asked (ask) me which animals I had seen (see) in Africa.
3. After Columbus had discovered (discover) America, he returned (return) to Spain.
4. Before they moved (move) to Liverpool, they had sold (sell) everything.
5. After he had worked (work) very hard, he fell (fall) ill.
6. She opened (open) the box after she had found (find) the key.
7. They went (go) to a restaurant after they had sailed (sail).
8. Before they started (start) the party, they had invited (invite) some friends.
9. After she had washed (wash) the curtains, she cleaned (clean) the windows.
10. They went (go) for a sightseeing tour after the bus had arrived (arrive).
11. Before he mowed (mow) the lawn, he had picked (pick) some roses.
12. After he had finished (finish) school, he worked (work) for a magazine.
13. They drank (drink) a cup of tea after they had finished (finish) lunch.
14. He had asked (ask) me for her telephone number before he phoned (phone) her.
15. My sister had eaten (eat) all the chocolate before my parents came (come) home.