1) In the last hundred years traveling (become) much easier and very 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. Things (change) a great deal in the last hundred and fifty years.
2) Mark’s English (improve, really), isn’t it? He (watch) American television programs and (study) his grammar every day since he first arrived in San Diego.

1) In the last hundred years traveling has become much easier and very comfortable. In the 19th century, it took two or three months to cross North America by covered wagon. The trip was very rough and often dangerous. Things have changed a great deal in the last hundred and fifty years.

2) Mark’s English is really improving, isn’t it? He has been watching American television programs and studying his grammar every day since he first arrived in San Diego.

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