Chapter 1: Problem 1
Yesterday afternoon, clouds rolled in, the sky grew ominous, and thunder (was, is) heard in the distance.
Chapter 1: Problem 1
Yesterday afternoon, clouds rolled in, the sky grew ominous, and thunder (was, is) heard in the distance.
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Get started for freeRoberts already (finished, had finished) the experiments by the time Fuller made the discovery in his own laboratory.
By the time Spanish explorers first encountered them, the Aztecs (have developed, had developed) the calendar.
My new co-workers (had been, were) very friendly to me until they learned my salary was considerably higher than theirs.
The Boy Scouts (love, loved) their new clubhouse, which they built last summer.
Since 1980, several economies in developed nations (are experiencing, have experienced) declines and recoveries.
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