Fill in the gaps with the Past Perfect or the Past Perfect Continuous. .Sam _____ (decide) that he was going to study Astronomy before he even finished secondary school.Before she got a promotion she ______ (not earn) enough to live comfortably.Before they invented washing machines, people _____ (wash) their clothes by hands for centuries.Mary _____ (wait) for half an hour before the bus came.They _____ (live) in Moscow before they moved to Stakhanov.​