Trabajar means: to work
Since it's your friend that works in a restaurant, you conjugate it to él/ella/ud.
Mi amiga <em>trabaja</em> en un restaurante.
Answer:
2nd one 3rd one 4th one and the last one
Explanation:
¿Con __QUIÉN__ estudias? Estudio.......
D- colectivo, es lo mismo que tomar el autobus
