I think what you're looking for is:
User-agent: *
Allow: /site/faq
Allow: /site/blog
Allow: /site/aboutus
Disallow: *
That specifically allows the three folders you mentioned, and disallows everything else.
Question
I want to allow only these urls to read robots in mysite
example.com/site/faq
example.com/site/blog
example.com/site/aboutus
All other URLs need to be blocked, what are the rules ? Thanks
Solution
I think what you're looking for is:
User-agent: *
Allow: /site/faq
Allow: /site/blog
Allow: /site/aboutus
Disallow: *
That specifically allows the three folders you mentioned, and disallows everything else.