Problem: Which nation acquired sovereignty of Carribean archipelago Puerto Rico in 1898, ongoing as its territory to 2010s?
======
A: usa

Problem: Which county finished bottom of division one with a record low points total?
======
A: northamptonshire

Problem: The Sopot International Song Festival is held annually in which European country?
======
A: poland

Problem: Invar is an alloy chiefly consisting of iron and which other metallic element?
======
A:
nickel