Past Simple vs Past Perfect

1. After they ........... (see) the Tower, they............ (go) to Westminster Abbey.

He ............(ask) me which animals I............ (see) in Africa.

After Columbus ........(discover) America, he......... (return) to Spain.

Before they ........ (move) to Liverpool, they ............ (sell) everything.

After he......... (work) very hard, he........ (fall) ill.

She...... (open) the box after she......... (find) the key.

They ........... (go) to a restaurant after.......... they (sail).

Before they........... (start) the party, they.......... (invite) some friends.

After she...... (wash) the curtains, she .......(clean) the windows.

They .......... (go) for a sightseeing tour after the bus.......... (arrive).