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 freeMy new co-workers (had been, were) very friendly to me until they learned my salary was considerably higher than theirs.
Each of the boys (is, are) overwhelmed by the amount of work to be done.
Every one of the golf balls (has, have) been hit into the sand trap.
Since 1980, several economies in developed nations (are experiencing, have experienced) declines and recoveries.
Unlike the brown sparrow, the passenger pigeon (was slaughtered indiscriminately, had been slaughtered indiscriminately) and became extinct in 1914.
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