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______ the secret of nature, the young scientist has little time for entertainment.

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needn't  couldn't   mustn't  won't  
can’t    shouldn’t    mustn’t    mightn’t  
won’t    needn’t    mightn’t    couldn’t  
didn’t tell    wouldn’t tell    will not tell    had not tell  
won’t    needn’t    mightn’t    couldn’t  
confidential  delicate  secret  sophisticated  
Devoted to bring out    Devoted himself to bringing out    Devoted to bringing out    Devoting to bring out  
Devoted to bring up    Devoted himself to bring up    Devoted to bringing up    Devoting to bring up  
I do    I don’t    I will    I won’t  
don’t    needn’t    mustn’t    won’t  
nobody but him knows the secret    we all know the secret except him    it's so dark that he can't see everything clearly    only the needs to keep the secret  
Devoted to betray   Devoting himself to bring to light   Devoted to unearthing   Devoting to exploring  
a;the   a;a   the;the   a;/  
can'1   mustn't   shouldn't   mightn't  
has he  hasn't they  hasn't one  haven't they  
won’t    needn’t    mightn’t    couldn’t  
confidential  delieate  secret  sophisticated  
I do    I don’t    I will    I won’t  
mustn’t  must  can  needn’t  

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