I wanted to give a quick shout-out to a non-profit organization that my cousin works for, Ayusa. They coordinate a program for foreign exchange students, and they’re actively seeking hosts right now for their out-of-country high schoolers. You don’t have to be a nuclear family to host: they accept all sorts of family structures and situations!
Although I’ve never personally hosted a foreign exchange student, it sounds like a great opportunity for both the host and the student. If it’s something you’re interested in, please check out their site, or go straight to the FAQ page about hosting.