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21.（  ）

• A、of
  

• B、in

• C、for
  

• D、to

3. Directions:In each of the following groups of words, there are four underlined letters or letter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation. Mark your answer by blackening the corresponding letter on the Answer Sheet.（）

• A、P（o）st
  
  

• B、 c（o）st
  
  

• C、 m（o）st
  
  

• D、h（o）st
  
  

57.(  )