Use "suspended". It is a past participle that functions as an adjective. "Suspend" is a verb and it doesn't work in your sentence.
Please do not use "pls" as a substitute for "please".
Please help me to write the correct sentence. "The classes will remain suspend on 25th sept,2014" or "The classes will remain suspended on 25th sept,2014". Which is correct? pls reply with reason.
Anirudha, months of the year are capitalised and you should leave a space after the commas.