25．The young man had made so much noise that he 　　　not have been allowed to attend the concert．

　　　 A．should　 　　　　　　 B．must　 　　　　　　　 C．could　 　　　　　　 D．need

24．There happened to be nobody under the wall when it fell down, ____ ?

　　　 A．wasn't there　　 　　　　　　　　　　　　　　　　 B．was there　

　　　 C．didn't there　　 　　　　　　　　　　　　　　　　 D．did there　

23．Do you know ____ that made it possible for them to continue their project?

　　　 A．what it was　　　 　　　　　　　　　　　　　　 B．what was it　

　 　　 C．it was what　　　 　　　　　　　　　　　　　　　 D．it what was