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31. It’s not easy for experts to ______ H1N1 flu in humans from regular human seasonal influenz

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enough simple  easy enough  difficult enough  enough easy  
the no-kills model is very successful.  Stelios's expansion plans have great future.  Stelios can hardly repeat his soaring success in easy Jet.  Stelios is very careful in applying his model.  
easy; easy    easy; easily    easily; easily    easily; easy  
it very easy to do    it very easy done   it’s very easy to do    very easy to do it  
That’s    This is    It’s    He’s  
Yes, I do   No, I don’t   It is easy   Yes, it’s easy  
much; by  more; in  larger; by  larger; on  
difficult    easy    common    popular  
that    what    which    how  
it not easy to answer it    it was not easy for us to answer it    it’s not easy to answer    it not easy to answer  
easy    easier    easily    more easily  
I'm    There's    It's    That's  
easy    easier   easily    more easily  
I hope not    Yes, I have    I hope so    Yes, I’m afraid so  
much more easy   less easy   a bit more easy   a lot easier  
it very easy to do    it very easy done    very easy for doing    very easy to do it  
look into    slide into    break into    knock into  
the no-kills model is very successful.  Stelios's expansion plans have great future.  Stelios can hardly repeat his soaring success in easy Jet.  Stelios is very careful in applying his model.  
it very easy to do    it very easy done    it’s very easy to do    very easy to do it  

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