The concept of chemical equivalent is essential for understanding chemical reactions.

We are growing vegetables without using chemical fertilizers.

This park charges fees.

It will still take some time to complete the report.

We went to the supermarket to buy food.

He received psychotherapy and got help understanding himself.

He received money from me.

We hired a professional to survey the new land.

Currently, only symptomatic therapy exists for this disease.

The postage for this product is free.