Sometimes I watch English movies, but I couldn't understand wha t they said because they speak too fast for me. Recentry I'm listening to ESL podcast and it's not difficult to understand because they speak slowly. Of course ESL means English for Second Language so they don't speak usual speed. So I would start listen faster speaking teaching materials. I know it's important that if I listen to English I should have to know the sentences, so I want to try such a textbooks with a sound source. When I was student, I see the ad, English adventure" or ""SIM in the newspaper. I tried SIM and actually my English score improved. I remember "SIM同時通訳方式". Anyway I have to try something again. But now I'm irresolute which material I should select. "English marathon", "Speed learning", "Super ELMer", "Pimsleur English" etc and all material isn't cheap. If possible I want to buy used. To decide the material I checked many web site but now I still can't what I try.