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 ci...

Câu hỏi :

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.