I need a expert comments on these XHTML 1.0 Strict element. should be use or not ? and how to use semantically?

address or microformat[/list:u]

b or strong[/list:u]

base[/list:u]

big or span class=big[/list:u]

blockquote or q[/list:u]

br [/list:u]

i or em[/list:u]

small or span class=small[/list:u]

hr[/list:u]