I am looking for an online site/program where I could refresh my french/english especially the french/english related to the hotel reception...
Do you maybe know such a site/program?
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I've used DuoLingo before, but it was a while back and not for very long so take this recommendation with a grain of salt. However, I have heard good things about it more recently from people I trust.
They use "gamification" to make learning addictive and fun, and they say they have science to back up their teaching methods.
It's a general-purpose language-learning program, so maybe it's not precisely what you're looking for, but it seems to be worth mentioning.
