http://camino-story.com/

http://www.englishclub.com/grammar/verb-tenses_past-continuous-quiz.htm http://www.eslcafe.com/quiz/past1.html http://www.eslmania.com/students/grammar/Grammar_Quizzes/past_continuous_tense.htm

http://www.bbc.co.uk/worldservice/learningenglish/grammar/pron/sounds/con_other_6.shtml http://www.bbc.co.uk/worldservice/learningenglish/grammar/pron/sounds/  

http://englishexam.blog.hu/2013/10/03/health_649 http://englishexam.blog.hu/2013/10/27/going_to_the_doctors

http://science.howstuffworks.com/transport/engines-equipment/train5.htm http://www.gizmag.com/future-transport/22959/