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16. The company’s sales have doubled since the introduction of new ________ technology.
A. full-length B. traditional C. cutting-edge D. standard

17. It was their determination that helped them ________ the enemy.
A. contain B. publish C. remain D. defeat

18. Nelson Mandela is one of the most ________ political leaders of the Twentieth and Twenty-First Century.
A. admired B. perfect C. talent D. skilled

19. When we were on a voluntary tour, we ________ to public places to collect rubbish every day.
A. were going B. went C. have gone D. had gone