If you are in the zoo, remember not to touch or go near the animals. Although some of the animals are cute, you _________ leave them alone. 

---Look!It _______ be Mr Zhang . ---No,it _______ be Mr Zhang. He has gone to Paris .

As a well-known Chinese saying goes, “If you want to be rich, you______ first build roads.”

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

John, look at the time._____ you play the piano at such a late hour?