What the children in the mountain village need ________ good books.
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 _____.
The World Wide Web is sometimes jokingly called the World Wide Wait because it _________be very slow.