1.a foreign exchange student: a student from a different country that is studying at university or school
I met a foreign exchange student from France in class today.
I was a foreign exchange student in China for one semester when I was in university.
2. to take a class: to attend and participate in a class
I am taking a yoga class these days.
Did you take an English class when you were in high school?
3. Hopefully,...: in a wishful or hopeful manner
Hopefully, I can finish my work by tonight.
Hopefully, we win the game.