should i submit the original documents?

i would like to know whether i should submit the original documnets at the time of interview and also will it be returned back immediately after the interview?please help.

Carry photocopies of the documents.

They may ask you to submit passport and 797 (original). For others, ask them if you can submit copies and then do that submission.

At times, they issue 221g and ask you to submit the copies later.