Alguno de los planetas tienen oxígeno en atmosfera?

Some of them have oxygen in the atmosphere, I don't understand the question but I do know what u were trying to say

The correct answer to complete the blank is:

-Trabajaron.

Mis hermanos trabajaron en un restaurante durante dos meses.

Explanation:

The key thing to solve the question is the tense of the sentence.The sentence is in past tense.Mis hermanos (my brothers) are a plural sustantive.

The conjugation options are:

Trabajé (past tense but for singular person)Trabajamos (past tense but for nosotros (we))Trabajaron (correct. because is the right conjugation for they (mis hermanos))Trabajaste (past tense but for singular person)