阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Columbus Day, which is celebrated 1 (annual) on the second Monday of October to honor an Italian explorer, Christopher Columbus, “discovering” the Americas, has always been a controversial holiday. Though Columbus found the continent, he never set foot 2 the mainland, even on his following three journeys. Besides, North America had already been “discovered” by the Native Americans. They had been living there for many 3 (generation).
Critics also maintain that 4 explorer was not out on a scientific “voyage of discovery”. Instead, he was on a mission to conquer the new land. The Spanish army, which Columbus brought after the first trip, cruelly killed millions of locals 5 tried to resist. Those who survived were enslaved and forced 6 (work) in mines and plantations.
The federal holiday 7 (be) on the American calendar since 1937. However, as public awareness has increased, the popularity of Columbus Day has been decreasing in some states, with only 25 currently listing it as an 8 (approve) holiday.
The 9 (move) has also spread to Latin American countries. “Day of the Race”, which is called in Mexico, honors the people and the influence of the 10 (represent) cultures, brought in by Christopher Columbus. However, many feel it is a reminder of the past and current struggles faced by the native population.
