24.   Since he has no sense of ______ humor, I’m sure he didn’t catch ______ humor in your remarks.       
A. 不填; the     B. a; the    C. a; 不填   D. the; a
25.   The city assigned a policeman to the school crossing because ______ traffic there was so heavy.      
A. a     B. an     C the        D. one
26.   It is known to all that ___ light travels faster than  ___ sound. 
A. /; /    B. a; a     C. the; the     D. the; /
27.   【2010福建】 It’s     good feeling for people to admire the Shanghai world expo that gives them  ______ pleasure
A.不填,a   B. a,不填 C. the ,a   D. a,  the 
 
 
 
