______, he makes little progress. So he is trying new methods of study. Which of the following is
WRONG?
[     ]
A．Hard as he works
B．Hard although he works
C．Hard though he works
D．Although he works hard
-What has Tom been doing recently?  
-I don’t know, ____care. 
[     ]
A.nor do I      
B.nor I do  
C.neither am I      
D.neither I am
—Do you have any idea what your former boss would say about you?
—I don't know,________.
[     ]
A. so do I care  
B. so I don't care
C. nor I don't care  
D. nor do I care
It was announced that only when the fire was under control ________to return to their homes.
[     ]
A. the residents would be permitted
B. had the residents been permitted
C. would the residents be permitted
D. the residents had been permitted
So desperate ________ that no one could help another, each ________ to save himself and his animals.
[      ]
A．was the situation; was trying
B．the situation was; trying
C．the situation was; was trying
D．was the situation; trying
Not until the taxi disappeared in the distance ________her handbag was gone.
[     ]

A．Tina had found  
B．had Tina found
C．did Tina find  
D．Tina found

So hard-working _____ that he sets a good example to all the other classmates.    
[     ]
A. he is  
B. is he  
C. does he
D. he does
Not until _____,_______the diffiult problem.
[     ]

A.did he return;we settled
B.he returned;we settled
C.did he return,did we settle
D.he returned;did we settle.

Only when _________ the tea-house _______ it was the same place he’d been in last year.
[     ]
A. did he reach; he realized      
B. he reached; he realized
C. he reached; did he realize    
D. did he reach; did he realize
Not until the early years of the 19th century ________ what heat was.
[      ]
A. man did know      
B. did man knew        
C. didn't man know        
D. did man know
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