Mark was a student at this university from 2006 to 2011，________he studied very hard and was made Chairman of the Students’ Union.

Will Jenny come tomorrow –I’m not sure. She ______ an hour ago without saying anything.

der if you have spotted my newly-bought magazine.—I saw Jenny going away with ______, but I am not certain whether it is exactly yours.

_______ with the present situation, the local government could not findeffective measures to reduce the risk of coal mine accidents.

Excuse me. Could you please tell me ______ my car—Sure. Park it right here. I’ll help you.