In the United States there are, strict speaking, __1__
no national holiday, for each state must, through legislative enactment or executive proclamation, __2__
appoint the day which each holiday is celebrated. Congress and the president may establish legal holidays__3__
for the District of Columbia and for federal employees throughout the states and territories;
and by long custom,days that receive nationwide observation, such as Christmas, Thanksgiving, __4__
Labor Day, Independent Day, and New Year’s Day, are uniformly set __5__
apart by all states as legal, or public holidays. In 1968, federal legislation established Columbia Day __6__
as a legal holiday for the District of Columbia and for the federal government beginning at 1971. __7__
The law also provided begun in 1971 federal employees would be granted__8__
three-days weekends by observing Washington’s Birthday on the third Monday in February, __9__
Memorial Day on the last Monday in May, Columbus Day on the second Monday in October,
and Veteran Day on the forth Monday on October. By 1971, most of the states also adopted the new dates. __10__
参考答案及解析：
1.strict改为strictly
2.holiday改为holidays。因为原句的谓语动词为复数are，所以holiday必须使用复数。另外no后面可以用复数也可以用单数。
3.which前面加上on。因为先行词the day在关系从句钟做状语，还原回去应为：each holiday is celebrated on the day，所以必须加on。
4.obsevation改为observance。observation意思为“观察，观测”，observance则表示“遵守，庆祝”。
5.Independent改为Independence。独立日的说法是“Independence Day”。
6.apart改为aside。set apart 指“使分离，使分开”，语义不同，set aside表示“留出，保留”的意思。
7.at改为in
8.begun改为beginning。动词begin和分句的主语federal employees的关系是主动的，应此要用beginning。
9.three-days 改为three-day。用连字符连接起来的表示数量的名词的前置修饰语的复数概念仍然是单数，如：a million-pound banknote。
10.also前面加had。如果一个句子里面有by引导的时间状语从句则动词一般用完成体。
