No.
The euro.
As of the 1st of January 2014, the Euro is the currency of Latvia, so you can use it there now.
Yes it was accepted in 2008
we're using euros now
No, the euro is not accepted as legal tender in Switzerland. The official currency of Switzerland is the Swiss Franc.
No.
Yes, the currency of Slovenia is the Euro.
Romania, Bulgaria, Latvia, Lithuania, Estonia, Poland, Hungary and the Czec Republic are obligated to join the Euro in due course and are all working towards the economic convergence criteria. Sweden is obligated to join the euro in due course but for political reasons has deliberately remained outside the convergence criteria. The United Kingdom and Denmark are not obligated to join the euro and have chosen to opt out for the time being.
yes
Yes, you can! Euro from France are accepted everywhere! If you have euro bills, track them in eurobilltracker.eu . there you can find also good information about the Euro
Lithuania does not use the Euro. It's currency is the Litas. Only 17 of the 27 countries that are members of the organisation called the European Union use the Euro. The other 10 countries, Lithuania being one of them, use their own currencies.