Have you ever seen the advertisement: Learn a foreign language in six weeks, ___ 1 get your money back? Of course, it ____ 2 happens quite like that. The only language that is ____ 3 to learn is ones mother language. And think about _____ 4 time is needed for that. Before the Second World War people usually learned a foreign language __ 5 the literature ( 文学 ) of the country. Now, most people want to ____ 6 a foreign language. Every year millions of people start learning ____ 7 . How do they do it? Some people try at home _____ 8 books and tapes; others go to evening classes or watch TV programs. ____ 9 they use the language only two or three times a week, learning it will _____ 10 a long time, like language learning at school. A few people try to learn a language fast by studying for six or _____ 11 hours a day. It’s much easier to learn the language in the country where it ____ 12 . But most people are ____ 13 to do this, and many people don’t have to do so. Machines and good books can be very ____ 14 , but they cannot do the students' work. ______ 15 the language is learned quickly or slowly, it is hard work.