---How long have you retired ,Grandpa? ---Well, four years. But you know, I_____ for Courtaulds for over forty years.
The boss asked him to leave; _____, he was fired.
Computers should be made readily ________to teachers and pupils.
You should remember that the harder you work, __________.
The air ______ different gases _____ together.
Our school was moved to Gaoxin District in 2005, and the new campus is ________ the old one.