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By the time he was 38, he had become ________ principal of ________ university.

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Louis Braille tried; he announced    did Louis Braille try; he announced    Louis Braille had tried; did he announce    had Louis Braille tried; had he announced  
settled  settling  to settle  settle  
he went ; had    did he go; did have    he went; did have    did he go; had  
wasn’t he    was he    didn’t he    did he  
realized he    he had realized    did he realize    has he realized  
Every time ; giving up    At one time ; to give up    At a time; gave up    At that time; giving up  
So he had;so did I  So had he;so I did   So he did;so did I  So did he;so I did  
has had    had had    has    had  
Hardly had he had; than    Hardly had he had; when    He did hardly have; when    He had hardly had; than  
Hardly had he had, than    He had hardly had, when    Hardly did he have, when    He had hardly had, than  
hadn’t he    had he    didn’t he    did he  
So he had ; so did I   So had he ; so I did   So he did ;so did I    .So did he ;so I did  
is  had been  will he  is going to be  
he realized    did he realize    he had realized    had he realized  
he realized    did he realize    he had realized    had he realized  
wasn't he  was he  did he  didn't he  
he realized  did he realize   he had realized  had he realized  
has had    had had    has    had  
he realized    had he realized    he had realized    did he realize  

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