Hi guest! I guess it's '..... ' because when 'one billion' is a number you have to write it in plural, for example, 'John lent Mary one billion Euros ' ---- But I have another question Spaniards say 1000 Meuros when they are talking about one billion Euros.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.