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(1分)He found     very difficult     the math problem. A.this,solving B.that,to solve  C.it,solvin...

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it's    that is    that    it  
was very aware of    well awared of    was well aware of    very awared of  
knew     looked at     recognized     found  
found    knows    finds    learned  
that he was a very foolish person  that he had got used to the cry for help  a large green and red bird flying into his living room from his neighbor's house  the secret  
outside  inside out  side out  back out  
friend   neighbor   owner   own  
outside  inside out  side out  back out  
that; to ride    it; riding    it; to ride    it is; to ride  
its    it    was    that  
to get along with    getting along with    to get along    to be gotten along with  
outside    inside out    side out    back out  
because  though  while  so  
surrounding; looked    surrounded; looked    surrounding; looking    surrounded; looking  

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