---How ____ is it from here Ningbo to Xi’an?---It’s about two ____ flight.
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!
We couldn’t wait _______ a good rest after the exam.