Who is _________ in your school, Mr Wang or Ms Lee?
— Who are you waiting for? — ______ the man wounded in the left leg.
The scientist corresponds with colleagues in order to learn about matters ______ to her own research.
Education should not be considered to be a(n) ______ in a modern society.
It is often recommended that children _____ chances to get close to nature.
— Do you think it wise for Chinese mothers to try to do everything for their children? — No, that’s ______ they are mistaken.