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Jack     a few discoveries in chemistry since he became a scientist. A. is making B. will make C. ...

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nothing    neither    some    none  
/, /    a, /    a, the    the, the  
which I think they are    which I think are   I think which are    that I think they are  
all    neither    some    none  
all    neither    some    none  
little   few   a few   a lot of  
No, she was  No, she wasn't  Yes, she was  Yes, she wasn't  
No,she was   No,she wasn’t   Yes,she was   Yes,she wasn’t  
How; so    What an ; so    What; so    What; such  
No, she was  No, she wasn’t  Yes, she was  Yes, she wasn’t  
a little    little    a few    few  

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