Translation of tireless in Spanish

How long have you being teaching Russian and why do you want to learn Spanish? Since when do you learn it? Are you traveling often and if you do in which countries? Are you from Moscow or St. Petersburg?
I have many hobbies. I like to go to the movies (thriller), I am enjoying to hear the radio, and I like to meet friends for coffee, I like to read and I like to watch DVDs at my house.
I have made an internship at a law office, but just for two months. Their salary is really bad. Now to my promise to correct your long message. You need to say: 'On Friday' not 'At Friday'.