30． the people have become masters of their own country that science can really serve the people.
A．Only then B．It is only when C．Only when D．It is only then
29．--- How about the book you are reading?
--- Good indeed. It many problems we have come across in our study.
A．says B．talks C．covers D．refers
28． a room in the hotel, Mr. Wood went out for a walk around the small town.
A．Taking B．Taken C．To take D．Having taken
27．Sales of CDs have greatly increased since the early 1990s, when people to enjoy the advantages of this new technology.
A．begin B．began C．have begun D．had begun
26．I accept that he is not perfect, I do actually like the person.
A．while B．since C．before D．unless
25．Why didn’t you tell me there was no meeting today? I all the way here the heavy snow.
A．needn’t have driven; through B．can’t have driven; across
C．mustn’t have driven; through D．shouldn’t have driven; cross
