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In the last hundred years, traveling________ (become) much easier and more comfortable. In the 19th century, it _______ (take) two or three months to cross North America by covered wagon. The trip _______ (be) very rough and often dangerous. The situation________ (change) a great deal over the last century. Now you can fly from New York to Los Angeles in a matter ofhours.

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The answers to fill up the above are:

  1. has become
  2. took
  3. was
  4. have changed

What are tenses?

Tense are known to be words that are often used to communicates a given scenario or event's location in a timely way.

Note that there are different tenses that can be linked to their verb forms. There are three types of tenses:

  • Past
  • present
  • future.

The answers to fill up the above are:

  1. In the last hundred years, traveling has become much easier and more comfortable. The verb has change to "has become" because it is still in the present continuous tense that is the action is still in progress.
  2. In the 19th century, it took two or three months to cross North America by covered wagon. The verb has changed to "took" because the event is in the past tense.
  3. The trip was/ is very rough and often dangerous. One can use is or was in this case as both are correct.
  4. The situation have changed a great deal over the last century.

Learn more about traveling from

https://brainly.com/question/8913038

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