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You're describing a long wait at a busy café. Select the correct option for each blank.
"I waited for _________________________ hour to get a table! But _________________________ coffee was worth it—best I've ever had."
The correct answers are an hour and the coffee.
"Hour" has a silent "h," so it begins with a vowel sound (/aʊ/)—use an. We use the for "coffee" because we mean the specific coffee at that café, not coffee in general.