In class we must listen to the teacher ________.

1. A.
   enough careful
2. B.
   careful enough
3. C.
   carefully enough
4. D.
   enough carefully

 We must listen ________ the teacher carefully in class.   

   A. at                B. in                C. on              D. to

In class we must listen to the teacher ________.

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In class we must listen to the teacher ________.

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