You should get down to your study from now on.Please________what is of great importance for

your future development . [    ]

A. concentrate on  

B. depend on

C. put on  

D. take on

各级清算机构要根据辖内清算资金往来情况，合理设定清算账户（）参数值，定时监控头寸信息，严禁清算账户出现日间或日终透支情况。

A.预警

B.头寸

C.余额

D.实时