From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Ex Input:
Given Relationship: 'invade', Sentence: 'Poland hopes Russia will invade Ukraine and give L\ 'viv to Poland for their support of invasion , as it has happened a few times in the past .'

Ex Output:
invade

Ex Input:
Given Relationship: 'attack', Sentence: 'The U.S. has pledged to warn Israel of any attack against Iraq .'

Ex Output:
attack

Ex Input:
Given Relationship: 'begin in', Sentence: 'World War I begins in Europe on July 28 , 1914 when Austria-Hungary declares war on Serbia .'

Ex Output:
begins