Final answer:
The best verb ending to complete the sentence is '-es'.
Step-by-step explanation:
To complete the sentence, the best verb ending is -es. Therefore, the correct sentence is 'Mi madre hace la cama'. The verb 'hacer' means 'to make' in English, and in this context, it is conjugated in the third person singular form to match with 'mi madre' (my mother).
Learn more about Verb conjugation in Spanish