Mark was a student at this university from 1999 to 2003, ____ , he studied very hard and was made Chairman of the Students' Union.
We were ______ to learn that he had made a funny and foolish mistake.
I need new heels on these shoes; the present ones are all ______.
He______to a waiter, who got the message and brought the bill.
-Sorry, sir. I didn’t finish the assignment yesterday. -Don’t worry. You ______ hand it in tomorrow.
______ rich knowledge you have, you can’t stop learning, ______ society is always advancing.