21.   This year, a dozen or more cookbooks are being published about the Mediterranean, more than on any other single topic.

22.   What this means is about six minutes on a single topic.

23.   Communist North Korea insisted that its request for electricity be handled as the single most important topic in the economic dialogue.

24.   Each show deals with a single topic, such as farm life, fitness, learning to accept new friends and different cultures, safety and self-protection.

25.   In those talks, communist North Korea has insisted that its request for electricity be the single most important topic.