You _______have a wrong number. There’s no Mr Johnson here.

—I wonder why Mr Green hasn't showed up at the meeting yet.—I'm not sure，but he________in a traffic jam driving here.

The factory ______ its waste into the river, but now it deals with the waste in a new way.

—Look at the young lady in red. Is it Mrs. King?—No, It ________ be her. She is wearing a white dress today.

The World Wide Web is sometimes jokingly called the World Wide Wait because it _______ be very slow.