Question 1 with 1 blankTraten amablemente a la policía. . Question 2 with 1 blankTienen que pedirle perdón a su vecino. . Question 3 with 1 blankNo pueden contratar a un grupo musical sin permiso. . Question 4 with 1 blankTienen que poner la música muy baja. . Question 5 with 1 blankNo deben servirles bebidas alcohólicas a los menores de edad. . Question 6 with 1 blankNo pueden organizar fiestas nunca más. .

1. Tratenla amablemente.

2. Tienen que pedírselo.

3. No pueden contratarlo sin permiso.

4. Tienen que ponerla muy baja.

5. No deben servirselas a los menores de edad.

6. No pueden organizarlas nunca más.

Explanation:

It is called a direct object (in traditional grammar, direct complement) to the function played by a syntactic constituent (phrase, pronoun or a substantive subordinate proposition), different from the grammatical subject, which is necessarily required by a transitive verb

it is the person or object on which the action expressed by the verb falls, it is a modifier of the predicate. The direct object can be expressed by pronouns: lo, la, los, las. Substituting the direct object of a sentence for one of these pronouns is a recommended way to verify that it is indeed the direct object.