30. The three law ( ) officers on the plane came to the rescue of a fellow passenger who was allegedly trying to kill herself.

44、I can't go — for one thing, I have no money, and ( ) , I have too much work.

68、Dreams are ( ) in themselves, but, when combined with other data, they can tell us much about the dreamer.

67、As the director can't come to the reception, I'm representing the company ( ).

66、You must let me have the annual report without ( ) by ten o'clock tomorrow morning.

65、While he was in Beijing, he spent all his time ( ) some important museums and buildings.

64、The diversity of tropical plants in the region represents a seemingly ( ) source of raw materials, of which only a few have been utilized.

63、Rite of Passage is a good novel by any standards;( ), it should rank high on any list of science fiction.

62、In the present economic ( ) we can make even greater progress than previously.

61、We should make a clear ( ) between 'competent' and 'proficient' for the purposes of our discussion.

60、The chances of a repetition of those unfortunate events are ( ) indeed.