Security has been a big issue for E.T.S. since a 2002 incident in which an undetermined number of students in China , Taiwan and South Korea raised their G.R.E. verbal scores by logging on to Web sites in those countries and memorizing questions and answers posted by previous test takers .
China /location/country/administrative_divisions Taiwan
Taiwan /location/administrative_division/country China
NN VBZ VBN DT JJ NN IN NNP IN DT CD NN IN WDT DT JJ NN IN NNS IN NNP , NNP CC NNP NNP VBD PRP$ NNP JJ NNS IN VBG IN TO NN NNS IN DT NNS CC VBG NNS CC NNS VBN IN JJ NN NNS .
China
LOCATION
Taiwan
LOCATION
/location/country/administrative_divisions
Taiwan
LOCATION
China
LOCATION
/location/administrative_division/country