College Writing Skills with Readings 8th Edition by John Langan

Exercise 9

Underline the dependent-word fragment in each item. Then rewrite the items, correcting each fragment by attaching it to the sentence that comes before or the sentence that comes after it-whichever sounds more natural. Use a comma after the dependent-word group if it starts the sentence.
Philadelphia was originally a Quaker colony. That was founded by William Penn in 1681. By 1777, it had become the capital of the new United States.
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