______ the program, they have to stay there for another two weeks. 
[     ]
A. Not completing  
B. Not completed  
C. Not having completed  
D. Having completed
________in the queue for half an hour，Tom suddenly realized that he had left his wallet at home.
[     ]
A．To wait  
B．Have waited
C．Having waited  
D．To have waited
The old man, ____________ abroad for twenty years,is on the way back to his motherland
[     ]

A.to work
B.working?
C.to have worked
D.having worked

_______very late last night, my brother got up late and went to school without breakfast this morning.
[     ]
A. Working  
B. Having worked
C. Worked  
D. To work
She asked me to help her,  ________that she couldn't move the heavy suitcase.
[      ]
A. only to realize  
B. having realized
C. having been realized  
D. realized
He was very angry when his car broke down,  ________it serviced only a week before.
[     ]
A. having had  
B. having been had
C. to be had  
D. having
Johnson,     to grasp the chance to become a doctor,decided to take up teaching.
[     ]
A. fail  
B. failed        
C. to fail  
D. having failed
Walter offered us a lift when he was leaving the office, but ________our work, we declined the offer.
[     ]
A．not finished  
B．not having finished
C．finished  
D．having finished
      from other continents for millions of years, Australia has many plants and animals not found in  any
other country in the world.     
[     ]
A. Being separated                
B. Having separated      
C. Having been separated            
D. To be separated
_           that she didn't do a good job, I don't think I am abler than her.        
[     ]
A. To have said                
B. Having said        
C. To say                      
D. Saying
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