His hobby is collecting obsidian.

Asbestos is used in the walls of this building.

This wristwatch uses quartz.

She planted a pomegranate tree in the garden.

I am solving integration problems in math class.

His success is a matter of sooner or later.

He uses a wheelchair due to a spinal cord injury.

He uses a wheelchair due to a spinal cord injury.

The touchstone to see his true character is his reaction when he faces difficulties.

I blushed at her joke.