Take another look at the sentence:

After a successful interview at a bookstore, Julio patiently waited by the phone, hoping to hear that he had gotten a summer job, every call, though, was a twelve-year-old boy calling for Rosita, Julio's younger sister.

Julio patiently waited by the phone is a main clause. Hoping to hear is a present participle phrase. A present participle phrase will begin with an ing word like hoping. When a participle phrase follows a main clause, you often use a comma to connect the two.

Go back to the sentence to try again.

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