完形填空
The United States covers a large part of the North 1__ continent (洲), when this land first became a nation. After 2 its freedom (自由) from England, it has 13 states. Each of the states had a star on the American flag (旗子). As the nation 3 , new states were formed and there 4 new stars on the flag. 5 a long time, there were forty-eight states. In 1959 two 6 stars were added (加) to the flag, standing for (代表) the new states of Alaska and Hawaii.
