— Have you _______ read this story before? — Yes. I’ve _______ read it.
One of my ____ is clean, but _____ one isn’t .
When he walks ____ my desk , he often knocks my books ____ the floor.
The teachers often make us _____ in class , and life here makes us _______.
Light goes faster than sound.
Don’t __ to others like that. You should ___ politely.