Well, since nobody else has said it, I suppose I might as well...

RTFM. 

Try the "Utilities" manual, which covers Export/Import quite thoroughly.

In the meantime, I'll give you a hint...   Your solution will probably include:
    imp FULL=Y FILE=my_export.dmp ...


By the way, if you don't know how to "restore" them, you may want to ask yourself why you are making exports to begin with.  There is an excellent chance that they do not do what you think they do...





--
Cheers,
-- Mark Brinsmead
   Senior DBA,
   The Pythian Group
   http://www.pythian.com/blogs