If you ______ smoke, please go outside.
– Have you ever been back to our Alma Mater(母校) after graduation? -- Of course. _____. Which of the following is incorrect?
At the bell, the door opened and _____, dashing towards the dinning hall, all shouting and laughing.
It was on a train _____ I was travlling to Xi’an _____ I made the acquaintance of the old professor from UK.
– Excuse me, sir. But nobody _____ smoke here in the lift! -- Sorry! I didn’t see the sign.
-- If you _____ away our secret that day, the current situation _____ different. -- Sorry, but _____ to do that.