[Answer] In what city did black-clad protesters hurl petrol bombs and stones in clashes with police on December 6, 2011, to mark the 2008 shooting of a student?

Step 1 : Introduction to the question "In what city did black-clad protesters hurl petrol bombs and stones in clashes with police on December 6, 2011, to mark the 2008 shooting of a student?"

...Hint :Acropolis

[Answer] What city, that became a capital in 1991, saw protesters gather to oppose the elimination of a fuel subsidy that doubled the cost of gasoline in their country?

Step 1 : Introduction to the question "What city, that became a capital in 1991, saw protesters gather to oppose the elimination of a fuel subsidy that doubled the cost of gasoline in their country?"

...Hint :Capital