Alter table Question in Sql 2000

How to add multiple columns with alter table command in Sql 2000 ?

ALTER TABLE [deneme].[dbo].[Mudurluk]
ADD HarcamaYetkilisi varchar(50) COLLATE Turkish_CI_AS NULL

//below gives error
ADD MaliKontrolYetkilisi varchar(50) COLLATE Turkish_CI_AS NULL ,
ADD Memur varchar(50) COLLATE Turkish_CI_AS NULL ,
ADD Sef varchar(50) COLLATE Turkish_CI_AS NULL ,
ADD MuhasebeYetkilisiYardimcisi varchar(50) COLLATE Turkish_CI_AS NULL

Can you help me with this ?

Thanks alot in advance

Specify ADD only the first time.