— All of us are proud of the progress he's made during the past few years.

— Yes, we're sure he wil be even ______. [ ]

A.successful

B.more successful

C.most successful

D.successfuly

选择合适的试剂（适量）对下列待提纯的物质进行除杂(括号内为杂质)，

并写出相应的离子方程式。