Someone

<IfModule mod_rewrite.c>
RewriteEngine On
#RewriteBase /blog/
#RewriteCond %{REQUEST_FILENAME} !-f
#RewriteCond %{REQUEST_FILENAME} !-d
#RewriteRule . /blog/index.php [L]
RewriteRule ^blog/Category/Main blog/index.php?cat=2 [L]
RewriteRule ^blog/Category/Technology blog/index.php?cat=4 [L]
RewriteRule ^blog/Category/Miscellaneous blog/index.php?cat=5 [L]
</IfModule>