This kind of fried chickens sells ______, mainly because it tastes ______.
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 filmC, the film was D. the film it was