God！My cell phone is missing.—You ________ have left it at home.I heard you telephone our daughter in the bathroom.

Seeing the looks on their faces，we can’t really imagine what they are________.

Were you at home at 7:00 yesterday evening I called you but no one was there. —Sorry, we ___________ a movie at the theatre at that time.

He used to be ________ UNICEF worker, but now he is really ________ excellent basketball player.

Why isn’t Cathy here yet?— She _________ to be picked up at the station．