This mountain is steep, making it difficult to climb.

The steepness of this mountain is a big challenge for climbers.

This field is using stable manure as fertilizer.

We used manure to fertilize our garden.

This marathon is the best opportunity to test your endurance.

He made a romantic proposal of marriage to her.

He proposed to her in the park.

I have been to Daegu.

He bought nine apples.

He smelled the scent of the flowers.