No such authorization ______ be given without the president’s written permission.

.---I didn't go to work yesterday because my car broke down. ---You ____ mine. I wasn't using it then.

 I insist that he _______ medicine instead of law.

It's dark, Mum ___ be waiting for my return.

— Hello, can I speak to Frank?— I’m sorry, he’s just left home. He     reach his office by 9:30.