Those who are not admitted to university, ________, may attend some other courses or classes for adult higher education.
It was not until 1920_________ regular radio broadcast began.
It was in the factory _________ produced TV sets _________ I got to know her.
Factory workers have to work very hard, and _________.
Only when David did it a second time _________.
So instructive _________ that the student wanted to see it again. A. was the film B. it was the film C, the film was D. the film it was