1.In exchange, it would pay Colombia ten million dollars, plus two hundred fifty thousand dollars a year.

in exchange为了换取,作为对…的交换

例句：What will you give me in exchange?
      你给我什么作为交换呢？

2.President Theodore Roosevelt has kept his word. Long live the Republic of Panama! Long live President Roosevelt!

keep one's word遵守诺言, 守信用

例句：I kept my word to her.
      我对她守信用。

3.Roosevelt said the United States was responsible for making sure the debts were paid.

be responsible for为...负责,形成...的原因

例句：He is responsible for the assignment of jobs.
      他负责分派工作。

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