There are some old cities in Turkey. Some of the cities are over 2,000 years old. No one lives in these cities today, but people still ＿＿（41）＿＿ them. Why do tourists want to see them? Because the cities are under the ground! The cities had kitchens. They had meeting rooms. They had places to ＿＿（42）＿＿ cereal. They had tables. They even had air tunnels or chimneys. The air tunnels made it ＿＿（43）＿＿ to breathe more than one hundred feet under the ground. They kept fresh air flowing through the ＿＿（44）＿＿ . The cities had locking stones. The stones could only be opened or closed ＿＿（45）＿＿ inside. The locking stones were used to keep the people safe inside the cities.