I'm from Vancouver, BC, a city that attracts large numbers of international students. Over the years, we've hired international co-op students and took on interns from language schools who were seeking to improve their English. We worked with co-op students from Hong Kong, Ecuador, South Korea, Brazil, China and South Africa. At one point, we had Brazilian and Korean co-op students simulteaneously. I think they learned a lot from each other, since they had to work together closely on a project we'd assigned to them jointly. We've also worked with the language schools (of which there are many in Vancouver to provide 1-2 days per week of work activities, usually for 8 weeks, designed to help them with their business English and carry out some basic tasks for us. These students came from Germany, Japan, Mexico and Venezuela.