Spot dictation: Human beings sometimes have to 1 , such as sign language or 2 on occasions when they cannot get their meanings across with spoken language, or when using language to communicate 3 . Some examples of the various forms of sign language are those used 4 , by football or basketball referees, traffic policemen, and auctioneers to name but a few. But perhaps the most unusual method of communication is 5 , which I found in Mexico recently. It was 6 in Mexico where I was traveling last month that I found some members of a community who live there using the whistled speech. I stayed in Mr. Martinez’s house for the night, and when I got up in the morning , I saw him 7 , whistling to a man 8 . The man was carrying a load of corn. Perhaps he was going to the market to sell it. The man answered Mr. Martinez with whistling. The 9 was repeated several times with different whistles. Finally the man turned around and came up the footpath to Mr. Martinez’s hut. Without saying a word 10 on the ground. Mr. Martinez looked the load over, went into his hut, returned with some money, and paid the man the asking price. The man turned and left. 11 . They had talked, bargained over the price, and 12 , but they only used whistling as a medium of communication. Originally I planned to leave for the next village after breakfast, but now I was 13 and I decided to stay a little longer to find more. As Mr. and Mrs. Martinez had to go out on some business during the day, I had no chance to talk to them. When they came back, they told me that they had a successful day and they invited me to have dinner with them. I thought it was a good chance for me to talk to them , so I 14 . I had expected them to whistle to each other at dinner, but they spoke in the normal way. I couldn’t resist the temptation to ask them why they didn’t whistle. Mr. Martinez laughed and explained: 15 and only men can use it. Women understand what it means but they never use it themselves. And, what’s more , the whistled speech is mostly for 16 , for bargaining, buying, and selling in the market place. As to when they 17 and why they have kept it up, neither of them had 18 . But I was 19 , and the next morning, I thanked Mr. And Mrs. Martinez 20 , said goodbye to them, and went on with my journey.