A. criminal 
B. charged 
   C. guilty 
D. faulty 
50. Having finished the letter, he ____ it carefully and sealed the envelop with a kiss.  
A. folded                           B. bent  
C. turned                           D. equipped 
51. The police were given an order that the stolen documents must be recovered at all _____. 
A. accounts                         B. conditions  
C. payments                        D. costs 
   52. This new instrument is far superior _____ the old one we bought three years ago. 
A. than                            B. to 
C. over                            D. of 
53. Not until I reminded him for the third time ____working and looked up. 
A. that he stopped                     B. does he stopped  
C. did he stop                        D. that he stopped 
54.I am very sorry for ____ for so long. 
A. keep you waiting B. having kept you waiting 
C. waiting for you                     D. keep you wait 
55. No sooner had they got off the train____ it started moving. 
A. when                           B. than  
C. then                              D. after 
56. The teacher has his students ____ a composition every other week. 
A. to write                            B. written  
C. writing                             D. write 

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