I don't understand what you mean by "missing".
Here is where to find posts > Posts > All Posts
Here is where to find Pages > Pages > All Pages
If you cannot find them there then please post here again and tell us what the titles of the "missing" ones are.
If you have created a custom menu then go here > Appearance > Menus and make sure you have incuded all pages and posts and other items you want included. http://en.support.wordpress.com/menus/
Troubleshooting – My Pages aren’t appearing > http://en.support.wordpress.com/pages/
They must be public pages – not private.
Public – The page will be visible to everyone.
Protected – The page is protected with a password you set. Only people who have the password can view a protected page.
Private – Pages are only visible to blog Editors and Administrators. Private pages are not visible in Blog Surfer, feeds, or in any search. A page can be private without being password protected.