Choose the correct answers. Use Past Perfect Continuous only where necessary
Athens's history [have already existed|has already existed|had already existed|existing] when other civilizations did not even begin to develop. It [became|had become|becomes|has become] one of the most famous cities in the Mediterranean attracting a lot of tourists. In the 5th century BC, Athens [laid|had lain|had laid|lay] the foundations of western civilization in Europe. During the first half of the second millennium AD, the city [was falling|fell|had been falling|felled] into decline up until the 19th century. Then, it [was reappearing|reappeared|had reappeared|was reappeared] as the capital of the independent Greek state, acquiring more glamour enhanced by its glorious history. Ancient Athens [occupied|was occupying|had occupied|was occupied] a very small area of the Acropolis — a natural defensive position on a high hill. Acropolis [became|was becoming|had become|has become] a major attraction for tourists since the 19th century. Ancient Greeks [had built|built|were building|were built] the most important religious site in Athens — the Temple of Athena. Today it [has drawn|is drawing|draws|drew] crowds of visitors from all over the world. Other minor temples [have lain|have laid|lay|were lying] in ruins for centuries. In the 5th century BC, Greeks [were created|were creating|had created|created] their constitution. The basics of that constitution [has lived|have lived|had lived|were living] through millennia and [have lost|did not lose|have not lost|lost] their importance to this day. These days it is worth remembering the time when a small village on top of the hill [was taking root|took root|had taken root|has taken root] on the Greek soil.