— I can’t get through to the general manager’s office.—The line is busy. Someone ________ the telephone.

—Have you invited Alice to our party?—Yes. But she _____ come; she is busy nowadays.

—________ you leave your room in such a mess?—Sorry，Mum.I forgot to tidy it up.

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. 

There ________ be any difficulty about passing the road test since you have practised a lot in the driving school.