In “ ...the train was approaching New York” a gerund is used as a/an 
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Some airports are concerned with easing distress passengers have to go through during inspection.
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People who regularly travel by air are not surprised by the security procedures.
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A member of a human rights group and a representative of a security firm have similar points of view.
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The word ‘changing’ (l.13) conveys the idea that threats are constantly evolving.
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the effects of El Niño phenomena are sure to reach South America before they have impact on the Northern Hemisphere.
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The word ‘robust’ (l.15) can be correctly replaced by effective without this bringing any change of meaning to the sentence.
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The world had never witnessed an ebola epidemic of such magnitude as the one mentioned in the text.
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The WHO mentioned has no intention of keeping biological material related to the disease.
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The West region of Africa is totally free from the Ebola virus.