Mark was a student at this university from 1999 to 2003, ____ , he studied very hard and was made Chairman of the Students' Union.
—The window is dirty. —I know. It ______ for weeks.
John plays football _______, if not better than, David.
Don’t worry. I’ll help to ______ the guests.
Nowadays some stars like________ because they can ________ a lot of money.
These plants are watered___________.