Future perfect vs future perfect progressive

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By the time we get to Chicago this evening, we _________ (drive) more than four hundred miles.

By the time we get to Chicago this evening, we will have driven more than four hundred miles.

When Sarah goes on vacation next month, she __________ (study) German for over two years.

When Sarah goes on vacation next month, she will have been studying German for over two years.

I have not traveled much yet; however, I _________ (visit) the Grand Canyon and San Francisco by the time I leave the United States.

I have not traveled much yet; however, I will have visited the Grand Canyon and San Francisco by the time I leave the United States.

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