—Susan ,you are doing worse. You have to _____more _____ your study than computer games.

—Yes. I must control myself.

A．concentrate;on

B．decide;on

C．take;on

D．spend;on

服务请求的新增方式有哪几种？（）

A.根据销售出库单生成

B.根据销售订单生成

C.手工新增

D.根据销售发票生成