He skipped a grade because of his excellent grades.

This mountain is steep, making it difficult to climb.

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

My horse is kept in that stable.

This field is using stable manure as fertilizer.

He took the horse to the stable.

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.