Only by imagining and creating ____the problem.
— Could you do me a favour?— It depends on __________ it is.
We haven’t settled the question of __________it is necessary for him to study abroad.
If there were no examinations, we should have ______ at school.
— If you don’t like the red coat, take the blue one.— OK, but do you have ______ size in blue? This one’s a bit tight for me.
With the development of the Internet, _______ communication is done by regular mail.