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 of hours.
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became
took
became
changed
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