We need to wait for Bill; he isn't ().

• A. Ready
• B. Set
• C. Prepared
• D. Done

Answer: (A)

The main idea here is choosing the word that best describes whether someone is prepared to start. In this sentence, we’re waiting for Bill to be prepared before moving ahead, so the natural completion is “ready.” Saying “he isn’t ready” communicates that he’s not yet prepared to proceed, which fits the context of delaying until he is.

The other options don’t fit as smoothly. “Set” is part of the familiar phrase “ready, set, go,” but used to describe a person by itself it sounds less natural here. “Prepared” is correct in meaning but sounds more formal than the casual context of waiting for someone to be ready. “Done” would imply he has finished something, not that he’s prepared to start.