The country's railway system has launched online ticket-booking and a real-name ticket purchasing system, and _______ requires passengers to provide their ID numbers when buying tickets.
The detective, _______to read a newspaper, glanced at the man _____ next to a woman.
The house is so large that we can _______it _______flats.
The children were not ______for the accident.
—I'm afraid I can't finish the book within this week. —________.
— Have you seen the film The sound of Music? — Not yet,but I________.