---I’m sorry, but there is no smoking on this flight.---Oh, I _____that. Sorry, I won’t again.A. don’t know B didn’t know C. won’t know D. haven’t known
Flying kites, ______ some researchers point out, can not only bring about joy to us, but also promote our physical and mental health.
Your daughter would ______ a famous singer---she has a great gift for music.
The younger policeman was leaning ______ the wall with his arms folded when he heard someone for help.
One of the tourists ______ from the tour group. That was why the tour guide lost his temper.
______ we talk to each other, I feel happy.