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As far as I know, the robot that can sweep the floor     in the 1980s. A.is invented B.invented  ...

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innocent    competitive    punctual    dynamic  
shouldn’t    mustn’t    can’t    wouldn’t  
won’t       mustn’t       can’t       wouldn’t  
A. How long is Yangtze River    How long Yangtze River is    How far was Yangtze River    How far Yangtze River was  
won't know   haven't known   doesn't known   didn't know  
needn’t  can’t  mustn’t  wouldn’t  
so far    at times    some day    the other day  
a better    the better    a best    the best  
in this way    as far as I know    as a matter of fact    in a word  
as soon as    as long as    so long as    so far as  
As long as   As far as   In case   Even if  
great, how far   great, what   far, how far   far, what  
shouldn’t  mustn’t   can’t  wouldn’t  
shouldn’t    mustn’t    can’t    wouldn’t  
In the name of   For the sake of   In terms of   As long as  
inncoent    competitive   punctual    dynamic  
a better    the better    a best    the best  
won’t    mustn’t    can’t    wouldn’t  
If I knew    If I have known    Had I known    Were I to know  

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