There may be some questions for which you simply don’t know some of the vocabulary included in the answer choices or in the sentence. While this can be frustrating, you should not immediately write off these questions as unanswerable. First, even if you don’t know the precise meaning of a vocabulary word, you may have a sense of whether it has a positive or negative connotation. In that case, you might very well be able to go through the sentence and figure out what type of word (positive or negative) needs to be used to fill the blank. It’s quite possible that only one word out of all the answer choices might fit the type of word you need. More likely, though, you’ll be able to eliminate some of the answer choices based on the criteria of positive or negative connotation, which will put you in a strong position to guess.

If the sentence completion is simply too hard, or if you think that it will take you a tremendous amount of time to eliminate even a few answer choices, then you should skip the question, marking it as one you might want to return to. The time you spend answering that question would be better used answering several easy and moderate analogy or reading comprehension questions.