EXERCISE 12. MARK THE LETTER A, B, C OR D TO INDICATE THE SENTENCE THA...
145. Thousands of languages are at risk of extinction. You know one of them, then teach it to others. 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