Oil prices have risen by 32 percent since the start of the year,         a record us  $ 57.65 a barrel on

April 4.      [ ]

A. have reached                    

B. reaching      

C. to reach                        

D. to be reaching

Attention,please,everyone! Please keep______for a moment when I take your photograph.[ ]

A. calm    

B. still    

C. silent    

D. quiet