You have two options. From the perldoc for CGI...

FETCHING THE VALUE OR VALUES OF A SINGLE NAMED PARAMETER:
@values = $query->param('foo');
-or-
$value = $query->param('foo');

Or you can have an array of names and do something like,

foreach my $key ( @expectedVars )
{
   print $query->param( $key );
}
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It really depends on what you are going for. If you want a user to select some out of many, checkboxes or radio buttons with the same name is the way to go, with the first option. If you want a bunch of different values, you can do the second one, but you may be better off with straight forward like...

if( $query->param( 'agreed' ) eq 'yes' )
{
... 
}

if( $query->param( 'uppercase' ) eq 'sure' )
{
...
}
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Play w/ it, see what you like.