Anchor: The reason for their  A national test could be embarrassing and disprove claims of improvement based on other, less-than-neutral testing regimes.
Entailed: A national test would embarrass the country. 
Contradiction: A national test would be welcomed by everyone.
Contradiction: there is an old man making sandwiches in a car
Contradiction: Drew could be a threat to Johnny.
Contradiction: The Portuguese never colonized any areas worth visiting.
Contradiction: The Caribs came and shattered the tranquility.