Read the passage and choose the best answer for the questions

Every year people in many countries learn English. Some of them 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 films, on television, in the office or among their friends. Most people must work hard to learn English. Why do all these people learn English? It‘s not difficult to answer this question. Many boys and girls learn English at school because it is one of their subjects. 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. English is learnt by...............