You must be a student, ________you?
Scientists have many theories about how the universe_____.
Teachers required that all the students ___ their homework all alone.
--- You didn’t go to the party last night, did you? --- I do wish I ___ there.
--- Can you tell me how many study groups there are in a class? --- Generally speaking, a class often ___ 8 study groups, each with 7 group members.
___ , he still put people’s life in the first place.