English Grammar and Sentence Correction Practice

Directions: This question presents a sentence, all or part of which is underlined. Beneath the sentence you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

While raw coca leaves, when chewed in moderation, prevent fatigue, hunger, and altitude sickness in most people, they are often toxic for others, who are habituated to them.