—A medical team was sent to Japan by air five hours ago.—So they ______________ have arrived by now. The flight usually takes four hours or so.

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

The winner of the race is tall and thin; he _______ be my friend, Mike, who is short and fat.

His work _____ have been completed; otherwise, he wouldn’t be enjoying himself on the beach.

It    be difficult to get a train ticket during traditional Chinese Spring Festival this year because there are many ticket windows.