Professor Li always allows his students to voice their opinions in class, ______ sometimes their opinions are not sound.
Are you still here? You ______ home hours ago.
As she’s not here, I suppose she _____ home.
You _____ him the news; he knew it already.
You _____ practise the drums while the baby is sleeping.
The police still haven’t found her, but they’re doing all they _____.