Verbs - ISEE Lower Level Verbal Reasoning

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Question

Choose the word or set of words that best completes the following sentence.

The scientist had to work for hours to                            the fluid, removing all of the harmful additives that it contained.

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Answer

The key clue for this question is the fact that the scientist is working to remove all of the harmful substances in the fluid. This does not mean that he wants to "liquefy" it—it is already a liquid! Also, while he is minimizing the additives, this is not quite the same as saying that he is removing them. When we remove additives or other "extra" material from a substance, we purify that substance. That is what he is doing. Do not be tricked by "scrub." Scrubbing is a physical kind of cleaning that is very particular. It is not a synonym for the general act of purifying.

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