Importance of foreign language in modern society

What do you think which language is most useful to know?

  1. slav
  2. English
  3. Russian and English very much information in this language.
  4. Chinese or indian
  5. English
  6. English
  7. Bicose I know England language but dont know others
  8. English
  9. English.
  10. English and Chineese