I am trying to help out some people in the law firm I work in by giving them English lessons (which I'm getting from a book or the internet - I've had no training in how to teach). I came across something I struggled to answer and wondered/hoped someone could help?
The following sentences appear with gaps and they have to complete using a suitable verb
a) Keith joined the company 15 years ago. He was quickly promoted and became assistant manager. A few years later he went on to become manager of the company.
b) When I came into the room, Liz was reading a newspaper. She looked up and said hello to me, and then went on reading her newspaper.
The book listed the words I have put in bold. The question from the student was if 'to become' is correct in a) why is 'to read' incorrect in b)?
My English grammar is not good enough to explain why. Is is because she was alrady reading and then continued reading? Can anyone help please?
Kind regards

