For each of the questions 13 to 16, select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.

Scientists have cataloged about 1.4 million living species with which mankind shares the earth. Estimates vary widely as regards the still uncatalogued living species, biologists reckon that about three to a hundred million other living species still __________ unnamed in ignominious darkness.

(A) thrive
(B) languish
(C) flourish
(D) remains
(E) deteriorate


Answer: (B) (E)

Explanation: As languish means forced to remain in an unpleasant place or is weak. Deteriorate also means the same rest of others are the opposite of it.
So, option (B) and (E) is correct.

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