Look at the following picture. what pronoun you would use when talking about these people? two female and two male students smiling

Ellos - it's the male version of 'them' because there are 2 males. it doesn't matter how many female is in the group, if there is at least one male, it's masculine. (like, 99 female and 1 male would still use the 'ellos' despite the fact that the majority are female) 

A0- losa1-verdea2-tizaa3-blancoa4-libroa5-esa

Alarge city is the answer