The light is on in Mr. Green’s room. He _______ be at home.

—Must I water the flowers now?  —No, you ________ . You __________ do it later.

It was playing video games that took the boy too much time that he          have spent learning．

— Professor Smith, some students want to have a talk with you. ___ they wait here or outside?— Show them in now, please.

I______ thank you too much for all your help to my son while we were away from home.