–Is there an express to Beijing tonight? -- There ______be , but you’d better call the booking office to make sure.’

 I ________ have watched that movie---it will give me horrible dreams.

 --Listen! Marry is singing in the next room. -- It __   ___ be Marry. She has gone home.

Please do not feed the fish; they _____ die if they eat too much.

---who______it be that is knocking at the door? ---It_______be Father, but I’m not sure.