https://elt.oup.com/student/englishfile/advanced/a_grammar/file02/?cc=hu&selLanguage=hu
https://elt.oup.com/student/englishfile/advanced/b_vocabulary/?cc=hu&selLanguage=hu
https://elt.oup.com/student/englishfile/advanced/e_lexis/file02/?cc=hu&selLanguage=hu
http://www.eltbase.com/quiz/073_01.htm
distancing or hedging:
http://www.lessonpaths.com/learn/i/distancing-devices/distancing-devices-exercises