The answer to the question about the trolls needs to be "they turnED to stone", as the question asks "what happenED to them". Or else the question needs to say "what happens to them". I suspect that's why no-one's got it right yet (or, make it easier, let us have it if we write the word "stone").
The answer to the question about the trolls needs to be "they turnED to stone", as the question asks "what happenED to them". Or else the question needs to say "what happens to them". I suspect that's why no-one's got it right yet (or, make it easier, let us have it if we write the word "stone").