Choose the best answer to complete the passage
In Cappadocia, Turkey, there are over 200 ancient cities under the ground. Some of these cities are about three thousand years (1)________. There are secret passages between the cities. The passages are sometimes many kilometres long.
In the past, there were thousands of (2)__________ in the underground cities. There were living quarters, kitchens, shops, churches, schools and places to keep animals and food. What was the reason for these mysterious places? Three thousand years (3)_________, people were frightened of the cold winters and of the wild animals above the ground. Later, people were frightened of the Romans, and the cities were good places (4)_________.
It probably wasn't fun living for months, or even years in these dark places. There wasn't any electricity and there weren't any sports centres, stadiums or other exciting places to go. But today, Cappadocia is an (5)_________ place to visit.
biết
Some of these cities are about three thousand years ____________.