Past Perfect and Simple Past

1. When I arrivedhad arrived (arrive) at the airport, my flight had already departedalready departed (already, depart).

2. Before I had gonewent (go) to bed, I readhad read (read) three chapters of the book.

3. They had never visitednever visited (never visit) that museum before they hadhad had a school trip.

4. Before she lefthad left (leave) for Paris, she had packedpacked (pack) her suitcase.