In Britain, you ____ be 18 if you want to drive a car.

Many experts hold the view ____teacherdevelopment is _____the key to better education lies.

He accidentally________he had quarreled with his wife and then he hadn’t been home for a long time.[ ]

We _______ many interesting books. He ________ only one.

Must I finish myhomework now?—No,you _______.