Access 2007 SQL the default value for switch

I am using switch statement in access 2007, i want to know how I can specify default value.
select
switch
(
MyCol = 1, ‘Value is One’,
MyCol = 2, ‘Value is Two’
) from MyTable
->

SELECT
Switch(MyTable.[MyCol]=’1′,’Terrestrial’,
MyTable.[MyCol]=’2′,’Value is two’,MyTable.[MyCol]=’3′,’Value is three’,
True,’Error’) AS ColumnName
FROM MyTable;