“Passengers _____ not have their breakfast on the light train”. This rule arouses heated debates in Chongqing.

--Jack had prepared for the game for such a long time. We all thought he ________ it. -- What a pity! He ________ too nervous when playing it.

–________ you turn down your radio, please? –Yes, I can.

-- Could I invite my friends to my birthday party?   -- Sorry, you _________.

---The man in a black suit _______ be our youth worker.---It _______ be him. I saw him in the classroom building some minutes ago.