阅读短文,从方框中选择适当的词并用其正确的形式填空,使短文意思通顺、完整,其中有两项是多余的。
 
  
   
  
    
     
      
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         something, swim, class, careful, hour, easy ,think, minute, what, eye , try , difficult.
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 It was the first biology class. The teacher wanted to give a good start to her
![]()
 . she wanted to open up her students’ 
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 to the world of biology . She knew that teaching those young students was not 
![]()
 , so she worked hard and 
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 to find a good way to teach them . After 
![]()
 a long time , She had an idea . She decided to show the children 
![]()
 interesting and give them a lesson at the same time.
 She asked her students to watch 
![]()
 . Then she began . She put a worn(虫) into a glass of water . the worn 
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 around in the water . Then she put a second worn into a glass of alcohol(酒). It was killed after a few 
![]()
 . She asked the students 
![]()
 they learned from it . A boy answered , “You showed us that if we drank alcohol, we wouldn’ t have worns in our stomaches. ”