18. The correct answer is (D). And creates an unidiomatic expression. The correct idiom is either . . .
or, not either . . . and.
(A) Which is a relative pronoun used here to introduce a clause that provides information about skill.
(B) To win is used here idiomatically.
(C) Comes correctly agrees with its singular subject skill. (Elections is not the subject of the sentence.)
19. The correct answer is (B). Amount is a word that in English refers to bulk quantities, such as a large
amount of sand. When we refer to discrete quantities, we use number, as in “a number of grains of
sand.” Amount should be changed to number.
(A) One is a pronoun that refers to decade and is correctly modified.
(C) By is used here idiomatically.
(D) Such as is an acceptable phrase to introduce examples of a general idea.
20. The correct answer is (E). The sentence as written is correct.
(A) Although is a subordinate conjunction that correctly suggests the contrast intended by the speaker
between democracy and slavery.
(B) Associate has the correct form to agree with we and has a meaning that is appropriate here.
(C) It is used here idiomatically. The phrasing used is similar to other English idioms, such as “It is
raining” or “It is well known.”
(D) Was correctly agrees with its subject, slavery, and indicates an action or condition that ended in
the past.
21. The correct answer is (E). The underlined portion of this sentence contains an error of grammar. It
has no referent, that is, there is no other noun (or pronoun) in the sentence for which it has been
substituted. This can be corrected by using the noun strike. Additionally, the original is needlessly
wordy. Notice that (E) is more concise, (B) fails to correct the faulty pronoun usage, and (C) and (D)
introduce new pronoun errors. Which and this, like it, are pronouns. And just as it has nothing to refer
to, neither which nor this has a referent.
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