The first team, was okay, the discussion was fluid.
In the one that talks about bill gates, they got stocked in some parts and i din't understood everything.
Bout the 3rd team, i found some mistakes on Carlos discourse and Alejandro did a lot of pauses.
In the one about diet sodas, Oh i liked it, it was funny. The pronunciation of Horacio is good, the other man, well, he's ok.
About the argue of heating food on plastics in microwaves, its great! Good pronunciation both and good arguments too.
