Read the sentences. Mariano traveled to Washington, DC, for the first time when he was in eighth grade. He thrilled to be going back. Which is the best replacement for the underlined words?

The sentence needs a form that describes how Mariano feels about going back. “He is thrilled to be going back” is grammatically correct; “thrilled” describes his feeling, and “is” completes the verb phrase. So the best replacement is “is thrilled.”

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