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1. This maintenance system we bought last week will keep your facilities safe and ------.
(A) efficiency
(B) efficient
(C) efficiently
(D) efficiencies
2. They firmly believe that about seventy percent of the total revenue should be invested in research and ------.
(A) developing
(B) developed
(C) development
(D) develop
3. The deal would be the first production sharing agreement between North Korea ------ a foreign energy company.
(A) but
(B) and
(C) nor
(D) or
<오싹 토익 본격 RC 문제 #32. 정답 및 해설 보러가기>
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