No, because Montenegro is not a member of the European Union.
It is not possible.
So long as you have all the needed travel documents to enter Morocco then you can travel there.
Yes, it is possible.
No you cannot enter without a valid Romanian Passport
A Romanian citizen can travel in European Union countries only with the ID.
Yes
The ID is sufficient.
Answering "Your passport got lost can you travel with your ID card?"
You can use your Greek ID card to travel from Greece to any of the eurozone countries.
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.
Yes, it is possible.
A passport card is a limited travel document that can only be used for land and sea travel to certain countries, while an enhanced ID is a state-issued identification card that has been upgraded to include additional security features. For international travel, a passport card is more suitable as it is accepted for entry into more countries compared to an enhanced ID.