In the passage given below, there are 5 blanks, each followed by a word given in bold. Each blank has four alternative words given in options (1), (2), (3) and (4). You have to tell which word will best suit the respective blank. Mark (5)  i.e No change is required as your answer if the word given in bold after the blank is your answer.

The 21st century has ___(A)___ (witness) unforeseen events which have altered the course of history forever. Besides the technological advancements, the biggest change undoubtedly has been the emergence of terrorism as one of the biggest global threats. Terrorism has been insidiously affecting lives all over the world and has resulted in spoiling the world peace at an ___(B)___ (alarm) rate. Be it a superpower like the United States of America or a developing country like India, terrorism continues to spread its roots with no concrete solution. It has not only ___(C)___ (debilitate) national security but has also led countries into a situation of anarchy.  

There are a number of far-reaching consequences of terrorism which must be understood clearly to know why nations are spending billions of dollars to root out terrorism from their land. First and foremost, any terror attack leads to change in foreign policies affecting the relationship of a nation with either its neighbour or some of its trade partners. The feeling of distrust and fear between countries is indeed ___(D)___ (disappoint) considering that none may be at fault. A classic example is that of India and its neighbouring country Pakistan which have time and again snapped trade ties after a terrorist attack and have not been able to come to an understanding to free some items from the ___(E)___ (restrict) list, thereby blocking potential opportunities for mutual growth and better understanding.