Only when he failed the exam ______ that he didn't work hard.
[     ]
A. he regretted
B. did he regret
C. had he regretted
D. does he regret
Only when people have enough to eat and plenty to wear ______ to talk about environmental
 protection. 
[     ]
A. it makes sense      
B. does it make sense  
C. that it makes sense  
D. do they make sense
Only in this way____to make improvement(提    高)in the operating system.   
[      ]
A. you can hope    
B. you did hope    
C. can you hope    
D. did you hope
Only after my friend told me _____ .
[     ]
A. realized I was wrong
B. was realized I wrong
C. did I realize I was wrong
D. I realized I was wrong
The computer was used in teaching. As a result, not only _____ , but the students become more interested in the lessons.
[     ]

A. saved was teachers' energy              
B. was teachers' energy saved
C. teachers' energy was saved              
D. was saved teachers' energy

—Did Linda see the traffic accident?  
—No, no sooner ____ than it happened.        
[     ]
A. she had left        
B. she left          
C. did she leave        
D. had she left
—How much do you know about the 3D film technology?
—A little. Not until ______ the hot movie Avatar ______ some about it.
[     ]
A. did I see; did I begin to learn          
B. I saw; I began to learn
C. I saw; did I begin to learn            
D. did I see; I began to learn
_____you eat the correct foods _____be able to keep fit and stay healthy.  
[     ]
A. Only if ; will you      
B. Only if ; you will 
C. Unless ; will you      
D. Unless ; you will
        that you didn’t care about this matter at all, I should not have wasted my time explaining it to you.  
[     ]
A. Should I realize        
B. Had I realized      
C. If I realized          
D. Did I realized
__________after the race that he didn’t know what to say before so many reporters.
[     ]
A. So excited the champion was    
B. So excited was the champion
C. So excited the champion felt    
D. So excited felt the champion
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