A. As long as you know one of thousands of languages that are at risk of extinction, then teach it to others.
B. If you know one of thousands of languages that are at risk of extinction, teach it to others.
C. For you know one of thousands of languages that are at risk of extinction, teach it to others.
D. Whenever you know one of thousands of languages that are at risk of extinction, then teach it to others.
Đáp án: B
Dịch nghĩa: Nếu bạn biết một trong hàng ngàn ngôn ngữ có nguy cơ bị tuyệt chủng, hãy dạy nó cho người khác.
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