My brother spends half an hour ________ computer games every day.
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!
When the player finished running, he was out of _____.