Why is English important?

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Across
  1. 2. oobsk
  2. 3. omsiev
  3. 4. niniotrafmo nileon
  4. 6. trnudnaeds gonss
  5. 8. emet oeplep
Down
  1. 1. boj ritsnetouopip
  2. 5. mtso eknops
  3. 7. egasm
  4. 9. rtvela aobrad