In this exercise, we are asked to choose the conjunction that most coherently complements the following sentence, taking the context into account: **No podemos usar aerosoles ( sin que / a menos que ) produzcan agujeros en la capa de ozono**.

In this case, the conjunction that most coherently complements the sentence is **sin que** because we want to express that the use of aerosols is harmful to the ozone layer.

No podemos usar aerosoles sin que produzcan agujeros en la capa de ozono.

In this exercise, we are asked to choose the conjunction that most coherently complements the following sentence, taking the context into account: **Las selvas tropicales serán bonitas ( a menos que / con tal de que ) no las explotemos**.

In this case, the conjunction that most coherently complements the sentence is **con tal de que** because we want to express that if we start exploiting tropical forests, they will stop being pretty.

Las selvas tropicales serán bonitas con tal de que no las explotemos.

In this exercise, we are asked to choose the conjunction that most coherently complements the following sentence, taking the context into account: **El presidente va a crear una ley ( para que / sin que ) nadie pueda cazar las ballenas**.

In this case, the conjunction that most coherently complements the sentence is **para que** because we want to clarify the purpose of the law that the president is going to create.

El presidente va a crear una ley para que nadie pueda cazar las ballenas.

In this exercise, we are asked to choose the conjunction that most coherently complements the following sentence, taking the context into account: **Tenemos que tomar conciencia de los problemas ( para que / aunque ) sea difícil hacerlo**.

In this case, the conjunction that most coherently complements the sentence is **aunque** because we want to express that although becoming aware of the problems is hard, we must do it.

Tenemos que tomar conciencia de los problemas aunque sea difícil hacerlo.

In this exercise, we are asked to choose the conjunction that most coherently complements the following sentence, taking the context into account: **El grupo de voluntarios construirá una reserva natural ( sin que / a menos que ) no tenga suficiente dinero**.

In this case, the conjunction that most coherently complements the sentence is **a menos que** because we want to express that unless the group of volunteers doesn’t have enough money, they will build a natural reserve.

El grupo de voluntarios construirá una reserva natural a menos que no tenga suficiente dinero.