Fill the gaps with the correct preposition whenever they show up. You should listen carefully, cause some sentences may not have a preposition.

This videos is about a waste management process and some necessary steps to design a waste treatment plant.

Solid Waste Management - Designing A Treatment Plant

solid-waste-management-designing-a-treatment-plant

Let's do English ESL general grammar practice. Fill the gaps with the correct preposition whenever they show up. You should listen carefully, cause some sentenc…