In this exercise, we are asked to complement the following sentence with the appropriate form of the present subjunctive of **terminar**: **Reciclaré el periódico cuando yo … de leerlo**.

In this case, the appropriate form of the present subjunctive is **termine** because we are talking about an action that hasn’t taken place yet.

Reciclaré el periódico cuando yo termine de leerlo.

In this exercise, we are asked to complement the following sentence with the appropriate form of the present subjunctive of **estar**: **Vamos a colocar estos recipientes en el depósito de reciclaje tan pronto como … vacíos**.

In this case, the appropriate form of the present subjunctive is **estén** because we are talking about an action that hasn’t taken place yet.

Vamos a colocar estos recipientes en el depósito de reciclaje tan pronto como estén vacíos.

In this exercise, we are asked to complement the following sentence with the appropriate form of the present subjunctive of **dejar**: **La contaminación no se eliminará hasta que la fábrica … de echar sustancias químicas al lago**.

In this case, the appropriate form of the present subjunctive is **deje** because we are talking about an action that hasn’t taken place yet.

La contaminación no se eliminará hasta que la fábrica deje de echar sustancias químicas al lago.

In this exercise, we are asked to complement the following sentence with the appropriate form of the present subjunctive of **beber**: **En cuanto … este refresco, voy a reciclar la botella**.

In this case, the appropriate form of the present subjunctive is **beba** because we are talking about an action that hasn’t taken place yet.

En cuanto beba este refresco, voy a reciclar la botella.