It is not possible.
No you cannot enter without a valid Romanian Passport
Yes
No, because Montenegro is not a member of the European Union.
Yes, you can. You must have your ID card, or passport, each one of them is ok. If you want to work there, remember to bring a legalized copy of you work permit up to that date.
15
idenafication card ( ID ) idenafication card ( ID )
Yes, it is possible.
A Romanian citizen can travel in European Union countries only with the ID.
Cheap ID card printers start around $800 and high quality ones can go all the way up to $3700 and more, it just depends what your needs are and how much you are willing to spend.
IT"S NOT FOR SALE ID IT WAS IT WILL COST $1 as much as you cost
5 dollars