It was back in the 14th century that the Great Wall of China ___ (undergo) reconstruction.
underwent
We ___ (be) listening to the presenter for some time, and I ______ starting to feel a bit sleepy. Then, she showed us some pictures of Peruvian mummies , and I certainly woke up.
had been listening - was
The lead actor ____ (hold) everyone's attention with his final, impassioned speech when, to my horror, my mobile ____ (go off).
was holding - went off
In the filme, they _____ (shoot) at the enemy for only a few weeks, but in reality the battle went on for months.
shot
It ___ (be) four long years of hard work when we finally ____ (locate) the treasure.
had been - located
The area now known as Pompeii ____ (inhabit) since the Bronze Age. But in 79 AD, Mount Vesuvius ___ (erupt) and ____ (wipe out) all signs of life.
had been inhabited - erupted - wiped out
It was only after traveling for half an hour that we _____ (realize) we _____(go) in the entirely wrong direction.
realized - had been going
The film suggests that some dinosaurs _____ (run) around in the last Ice Age, but we know that they had died out long before that.
were (still) running