The size of the generation gap seems to be spreading with ____ rapid changes in technology, in education, in transportation and in communication that are taking place all over ____ globe.
When ____ to compare the education system of China and Britain, the professor gave no answer.
Why not get some work experience first ______ go straight on to university?
What if we meet with a situation _______ none of us are able to deal with?
His lack of professional knowledge _______for the failure of the experiment.
Tom was about to close the window his attention was caught by a bird.