在下列括号中填上合适的词语。    

(    )的臂膀    朦胧的(    )    溪水(    )    

(    )的果实    跳跃的(    )    沟壑(    )

—Did he work out the math problem?        

—No, he thought hard, but could not ______ with a proper answer.[ ]

A. put up    

B. turn up    

C. show up    

D. come up