题目：

41.Either of the plans ______equally dangerous.

42.The police ______the murderer everywhere when he suddenly appeared in a theatre.
searching          searching for  
searching         searching for
 
43.Your trousers ______dirty, you must have______ washed.
it     it     them    them
 
44.The Olympic games ______held every four ______.
years    years    year     year
 
45.He is the oly one of the students who______elected.
     
 
46. ______a good enough price for this book
A.Two yuans are B.Two yuan are    C.Two yuans is     D.Two yuan is
 
47.No bird and no beast ______in the lonely island
seen     seen    
 
48.Every means ______prevent the water from______
used to polluting       B. get used to polluting
used to , polluted      used to ,being polluted
 
49.Each of the ______in the ship.
ger has his own room     B. passengers have their own room
ger have their own room   s has his own room
 
50.What we need ______good textbooks.
            

【答案解析】

 41-45 BBCBD      46-50 DBDDB