Công thức chung của ankađien là

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  It ________________ me that they can't sell their flat.
  
  

• Choose the best answer for the following sentence:

  A woman who ________________ after other people's children is a nanny.
  
  

• Choose the best answer for the following sentence:

  Be quiet, please. We ______________ at the translation and you _________________ a lot
  of noise.
   

• Choose the best answer for the following sentence:

  He always _______________ for a walk in the evening.
   

• Choose the best answer for the following sentence:

  ''Where's Jack?'' ''He _______________ his girlfriend at the station. She ________________ 
  at 12 o'clock.''
  
  

• Choose the best answer for the following sentence:

  She _________________ . Is something wrong?
  
  

• Choose the best answer for the following sentence:

  In the morning, I _______________ little time, so I  ____________________ a shower in the
  evening.
  
  

• Choose the best answer for the following sentence:

  A decade ________________ a period of ten years.
  
  

• Choose the best answer for the following sentence:

  Her brother ___________________ in Canada at present.
   

• Choose the best answer for the following sentence:

  She always _____________ but _________________ nothing to realize her dreams.