01 / 10TED≈ approximate level B26:48–6:57 , .
02 / 10CrashCourse≈ approximate level B111:52–11:59
, ; .
03 / 10Big Think≈ approximate level B12:25–2:31
.
04 / 10BBC Learning English≈ approximate level B11:49–1:57
, .
05 / 10TED-Ed≈ approximate level C13:37–3:44
’s - .
06 / 10CrashCourse≈ approximate level C111:44–11:53
, .
07 / 10TED-Ed≈ approximate level B10:58–1:06
, 's .
08 / 10TED-Ed≈ approximate level C11:40–1:50
, .
09 / 10TED-Ed≈ approximate level C14:03–4:13
, .
10 / 10Big Think≈ approximate level C12:43–2:57
, .