Don’t get off the bus ____ it stops.
—Our country _____ progress in science and culture in recent years.
When we went into the park, we saw someone _____ Chinese Kungfu.
—Have you ever _____ Mudanjiang to see the Jingbo Lake?—Yes, I have.
You’d better speak aloud ______ we can hear you.
—Lily, _____ you _____ your ticket?—Not yet!