run out (of)A.用尽,耗完 B.离开 C.试用
He is tall, _____ his son is short.
What can we students do _____ the environment?
There are five people in the room, but I know _____.
—What did our geography teacher say?—She told us that the earth _____ around the sun.
—Lily, _____ you _____ your ticket?—Not yet!