Complete the following sentence with a suitable word: He has been out ..........seven hours and he has not called...... a)yet.for b)for,yet c)already.for d)since,yet e) never,yet

The correct answer is b) for, yet. Here's why: * "For" is used to indicate a duration of time. * "Yet" is used to indicate that something hasn't happened up to the present time but is expected to happen. So the complete sentence is: "He has been out for seven hours and he has not called yet."