Having checked the doors were closed, and ________ all the lights were off, the boy opened the door to his bedroom.
The computer centre, ______ last year is very popular among the students in this school.
Mrs Smith warned her daughter ____ after drinking.
The murder was brought in, with his hands _______ behind his back.
It is no use _____to come now. He is busy.
Charles Babbage is generally considered ______ the first computer.