WHERE IS THE SHIPKA PASS?
1. Bulgaria's most densely populated urban area is…
A. Sofia
B. Vidin
C. Vratsa
2. Where is Bulgaria's best preserved ancient Roman stadium?
A. Plovdiv
B. Burgas
C. Melnik
3. Which river that springs in Bulgaria is the longest in the Balkans?
A. The Iskar
B. The Struma
C. The Maritsa
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