I know that the level of Circus will fit nicely in an advanced course, but the documentary combines both difficult and easy listening stuff, showing people who talk at length and those who just say a few words (giving us time to process what is being said and relax), and it presents the ideas and opinions of both native and non-native speakers of English. .
On top of that, this PBS documentary gives us the opportunity to activate the CC subtitles, so that we won't miss anything of what is being said.
Watch First of May on PBS. See more from Circus.
