1. After Edmund Hillary had climbed Mt. Everest, he looked for new kinds of adventures.
2. Before Martin Luter King died in 1968, he had led the Civil Rights Movement.
3. The first trip to the moon was successful, because many people had worked together on the space project.
4. After Neil Armstrong had stepped from the space ship, he said, "One small step for a man, one great leap for mankind.”
Объяснение:
Past perfect показывает какое из 2 действий произошло раньше.