---When will the expert come and give the lecture on intellectual property? 
---Not until our program _______ by the authorities. 
[     ]
A. approves
B. has been approved
C. is to approve
D. will be approved
Nothing but some ancient Chinese coins _______ in the sunken ship since they began the exploration.
[     ]
A. were found
B. has been found
C. had been found  
D. have been found
— Why does the lake smell terrible? 
— Because large quantities of water _________.
[     ]
A. have been polluted      
B. has polluted    
C. have polluted          
D. has been polluted
When and where to go for the on-salary holiday ____yet.
[     ]
A. are not decided      
B. have not been decided  
C. is not been decided    
D. has not been decided
—Why does the lake smell terrible?  
—Because large quantities of water ________. 
[     ]
A. have polluted
B. is being polluted
C. has been polluted
D. have been polluted
— I want to sit at the table near the air conditioner.
— I'm sorry, but it ________ already.
[      ]

A. has taken  
B. has been taken
C. was taken  
D. took

Two pieces of good news about our company ________ published in today's newspaper.
[      ]
A. have  
B. have been
C. was  
D. is
I want to buy that kind of cloth because I ______ the cloth _______ well .
[     ]
A. have told, washes    
B. was told , washed    
C. have been told, washes  
D. was told,  washes
Two thirds of the subway construction________so far and people will enjoy a fast and convenient
trip under the city early next year.
[      ]
A. have been completed  
B. is being completed
C. has been completed  
D. will be completed
All possible means ____, but nothing can prevent the buildings ____.
[    ]
A. has tried; from being pulled down    
B. have tried; from pulling down
C. has been tried; from pulling down          
D. have been tried; from being pulled down
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