When making bread, you need a leavening agent.

It is important to use mouthwash every day after brushing your teeth.

Choosing the flooring for the new house is difficult.

He couldn't answer the phone because of his absence.

This building is made of high-quality building stone.

He was entrusted with the receivership of the company.

This building is made of high-quality steel.

We are choosing building materials to build a new house.

This oil solution is used to reduce friction in machinery.

This mixture is used to alleviate the symptoms of a cold.