all the hotels were fully booked, of course, because every backpacker in spain were there.
-were이 왜 틀렸나요;;; 이유좀 가르쳐주세요ㅠㅠ

the toato fight in bunol [is/has been] a tradition since 1944 or 1945.
-has been이 정답인 이유가 과거에 일어났던 사실이라서 인가요?;; 정확하게 좀 알려주세요

we got a taxi at 5:45 a.m. and headed to the train station in the middle of valencia, but ( ) our disappointment it was already packed!
-to가 들어가야한다는데 이유가 뭔가요?