He is a man of few words, and seldom speaks until _______ to.
If the painting Mona Lisa is on your list of things to see, __________ sure to get there early as there will probably be a line.
Whoever leaves the room last must __________ that all the lights are turned off.
Our English teacher is very strict __________ us and __________ his teaching.
Mr Smith is strict __________ us __________ our studies.
She took drugs all day and showed no __________ for her children, who died of hunger at last.