— ________ doesn't always happen as we expect.

—Really! So we mustn't take the impossible things as our aims in case that we might be

   disappointed in future. [      ]

A.  Anything  

B.  Everything

C.  Nothing  

D.  Something

液压起货绞车的制动器在（）时抱闸刹车。

A.进压力油

B.泄压力油

C.A或B

D.刹车与否与压力油无关