I _____ my university professor in the supermarket near my house, which was out of my expectation.
The old professor told us that every part of the materials should be made use of _____ the station.
Safety in school has been of great concern because of frequent reports about accidents _______ students got injured or killed while in school .
----- Have you seen your nephew lately? ------ Yes, in fact, I saw him yesterday.I ______ him for three years.
Bob Geldof, who organized Live Aid, ______ to raise money for the famine and it ______ to be a great success.
------ Bob failed in the exam again . ------ He _____ it ; he never worked hard .