For the following sentences, identify the coordinating conjunction that best links the two parts of each sentence by filling in the blank.
For help with this exercise, see section 17d of Focus on Reading and Writing.
Today, many people write to record their feelings and ideas, _____ writing was invented as a way to keep more accurate business records.
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Writing was invented about 5,000 years ago, ____ it originated in Sumer in the region we now call the Middle East.
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Sumerians did not keep complete accounts of their belongings, ___ did they make detailed records of their business transactions.
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Most of the records they did make were of limited use, ____ they were nothing more than crude pictures on clay tablets.
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The Sumerians were originally herders and farmers, ___they began to live in cities as their population grew.
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