— ____can we board our plane? — In twenty minutes.A. How soon B. How long C. How often
—Would you mind my sitting here, Sir?—_________. It’s for my wife.
I_______ my homework when the door bell__________.
What are you busy doing, Sandy?—— I’m making some flash cards _________ me remember English words.
Have you bought_________ for Linda’s birthday?----Not exactly.Just some flowers.
—Mr. Black, may I leave now?—Well, if your work ________, you can go home.