

O Rui ganha mil euros por mês.
Há mil alunos nesta escola?
A viagem aos Açores não custa mil euros.
"mil" is in the lesson "Big numbers" (Level 4), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.