20. 艾森豪威尔(Eisenhower)在担任总统之前是一名将军。 他参加了什么战争?
Before he was President, Eisenhower was a general. What war was he in?
30. 联邦主义者文件支持美国宪法的通过。 指定一位作家。
The Federalist Papers supported the passage of the U.S. Constitution. Name one of the writers.
32. 亚伯拉罕·林肯(Abraham Lincoln)做的一件重要事情是什么?
What was one important thing that Abraham Lincoln did?