填空题 Can we save the world's {{U}} {{U}} 1 {{/U}} {{/U}}languages? The Hadza community lives in Tanzania. Their language—Hadza—is unique. However the language may not be {{U}} {{U}} 2 {{/U}} {{/U}}for long. There are now fewer than 1,000 Hadza {{U}} {{U}} 3 {{/U}} {{/U}}. The number will continue to {{U}} {{U}} 4 {{/U}} {{/U}}and their sing-song tongue, {{U}} {{U}} 5 {{/U}} {{/U}}with clicks and glottal stops, is no longer being learned by all Hadza children. The language is in danger of being {{U}} {{U}} 6 {{/U}} {{/U}}.
The Hadza are not alone in facing the loss of their {{U}} {{U}} 7 {{/U}} {{/U}}tongue. Every {{U}} {{U}} 8 {{/U}} {{/U}}days a language dies. Over half of the approximately 7,000 languages spoken on the planet may {{U}} {{U}} 9 {{/U}} {{/U}}by the end of the 20th century. Eighty percent of the {{U}} {{U}} 10 {{/U}} {{/U}}languages have no {{U}} {{U}} 11 {{/U}} {{/U}}form. {{U}} {{U}} 12 {{/U}} {{/U}}the last speaker dies, so does the language. But eighty percent of the world's population now speak just {{U}} {{U}} 13 {{/U}} {{/U}}of its languages. So, will the languages on the {{U}} {{U}} 14 {{/U}} {{/U}}be reduced to a {{U}} {{U}} 15 {{/U}} {{/U}}of tongues?
Not if some people have their way, who are fighting back to {{U}} {{U}} 16 {{/U}} {{/U}}rarer tongues successfully. Perhaps the most successful example is {{U}} {{U}} 17 {{/U}} {{/U}}, which was dead two centuries ago but is a living language now. Other languages have also been brought back from the brink of {{U}} {{U}} 18 {{/U}} {{/U}}through the sheer will and determination of their communities. Language preservation works best when the language, culture and {{U}} {{U}} 19 {{/U}} {{/U}}of minority-speaker communities are {{U}} {{U}} 20 {{/U}} {{/U}}by national governments.