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. 

—Where _____ Mary have put the empty bottles? — She _____ them away. They must be somewhere. 

---_____book is this? --- I think it _____ Carla’s. It has his name on it.

 The man in the office ____be Mr. Black because he phoned me from London just now.

If the students who killed themselves had only been more confident, their deaths ________.