Read the following passage and write the letter A. B. C, or D on your answer sheet to indicate the correct answer to each of the questions.    

    Every year students in many countries learn English. Some of these students are young children. Others are teenagers. Many are adults. Some learn at school, others study by themselves. A few learn English just by hearing the language, in film, on television, in the office, or among their friends. But not many are lucky enough to do that. Most people must work hard to learn another language         Learning another language! Learning English! Why do all these people want to learn English? Is it difficult to answer that question? Many boys and girls learn English at school because it is one of their subjects. They study their own language and Mathematics…and English (In England, or America, or Australia, many boys and girls study their own language, which is English, and Mathematics, and another language, perhaps French, or German, or Spanish) Many adults learn English because it is useful for their work. Teenagers often learn English for their higher studies, because some of their books are in English at the college or university. Other people learn English because they want to read newspapers or magazines in English. 

According to the writer,______.