The chairman was about to declare the conference open ____ the lights went all out.
Is it in the factory ______ you visited last week ______ this kind of car is made?
________ that I was a regular visitor, the servant let me in.
David and Jack, _____so much alike each other, were often considered _____ twin brothers.
Can you _____ the capitals of all the countries?
The soldier was _____ in the battle.