Where did you go ______ vacation ?A.at B.on C.in
—Is that boy Alan? —No, it ______ be him. He left for Beijing yesterday.
—Have you heard about the airplane accident? —Yes, all of the passengers on the plane lost their___________.
—_______ do you go to see your grandparents? —Once a week.
—When did you finish your homework last night? —A bit late, ________ my father came back home from work.
—What do you want to be in the future, Bill? —I want to be ______ fashion designer.