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1·At college, Barack Obama didn't know that he will be the first black president of the United States of America.

大学时期的巴拉克·奥巴马不知道自己将是美利坚合众国第一位黑人总统。

2·At college, Barack Obama didn't know that he was to become the first black president of the United States of America.

上大学时，巴拉克·奥巴马并不知道他将成为美利坚合众国的第一位黑人总统。

3·With my family we're excited to have this opportunity to serve the President and the people of the United States of America.

我和我的家人都很兴奋有这个机会为总统及美国人民服务。

4·For example, in the 1800s a monstrous earthquake changed the course of the Mississippi River, a large river flowing in the central part of the United States of America.

例如，在19世纪，一场大地震改变了密西西比河，一条流经美国中部的大河的流向。

5·I scrolled down to find United States of America.

我向下滚动以寻找。《柯林斯英汉双解大词典》

6·Many a student looking forward to visiting the United States of America at present.

现在许多学生都盼望着访问美国。

7·Many a student is looking forward to visiting the United States of America at present.

现在，许多学生都盼望能够访问美国。

8·On October, 1867, the flag of the United States of America was raised for the first time.

1867年十月，美国国旗第一次升起。

9·At college, Barack Obama didn't know that he would be the first black president of the United States of America.

大学时，巴拉克·奥巴马并不知道他会成为美国第一位黑人总统。

10·Welcome to the United States of America. Hwan-ying.

欢迎各位来到美利坚合众国，欢迎。