[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

[Answer] World leaders touched down in this city to gather for the G20 summit.

Step 1 : Introduction to the question "World leaders touched down in this city to gather for the G20 summit."

...Trade wars -- and the prospect of actual war -- will dominate President Donald Trump's agenda at the G20 in Osaka, Japan, Thursday for a highly consequential meeting of world leaders.

[Answer] 2. What does the proverb say that a rolling stone does not gather?

Step 1 : Introduction to the question "2. What does the proverb say that a rolling stone does not gather?"

...1. leaves 2. fruit 3. roots 4. moss I found an amusing quotation to share with you about this proverb. It comes from 'The Listener' of the 5th. July, 1979: 'A roadside notice said, in one long line: LOOSE STONES TRAVEL SLOWLY. Well, I daresay they do; rolling stones, we know, gather no moss.'

[Answer] Thousands gather at this prehistoric monument in England every year to mark the winter solstice.

Step 1 : Introduction to the question " Thousands gather at this prehistoric monument in England every year to mark the winter solstice. "

...1. Stonehenge 2. Newgrange 3. Goseck Circle 4. Machu Picchu