This Spanish Difficult Review quiz is going to test you on your knowledge of Spanish words that can answer the question of: Which one is? In other words, you are going to have to draw upon many of your Spanish vocabulary words – in categories. The concept of the quiz is very simple. You will be given a list of 4 vocabulary words and one of those words will answer the question: Which one is? For example: Which one is a fruit? This will show you just how quickly you can recognize Spanish words in categories, as well as show you how quickly you can pull the right answer out from your memory. So, with no delay, let’s jump right in and get starting with looking for which one is!