1.yo / the library 2. us / the pool 3.mis raw / the gym4.tour / excursion5.ustedes / the municipal park6.Alejandro / the science museum
The answer would be 3) Los. The object of the sentence, "boligrafos", is male and plural.
You use “es” an example is aviones. I hope this helps!
E.Poner la nevera en la cocina fácilmente= we could put the fridge in the kitchen easily(the rest options say the bathroom,hallway,food)