We should keep the door and the windows _________ to get quiet because it’s too noisy outside.

_______ a child begins school, he enters a world of vicious competition where success and failure are clearly defined and measured. [ ]

It was the man______ on the bed with his eyes open who_____the book open on the desk just now.

dren often form some bad habits, ____________remain withthem as ling as they live

Beijing is one of the _________________ in the worldtoday .